Replace scoped_ptr With std::unique_ptr

(This is a merge of http://go/wvgerrit/65782)

We have had our own scoped_ptr implementation that is used throughout
the codebase. Now that we support C++11, we can replace these with
std::unique_ptr.

Doing this replacement exposed a few places where the two were not
interchangeable. OEMCrypto Ref was doing some unsafe things with passing
scoped_ptrs to functions and has been updated to use move semantics. And
a few constructors were explicitly constructing a scoped_ptr with NULL,
which is ambiguous with std::unique_ptr. These have been replaced with
default constructor calls.

Bug: 111851141
Test: CE CDM Unit Tests
Test: Android Unit Tests
Change-Id: I37d6d7aad4906709381c74f0c5439f826d2be768

libwvdrmengine/cdm/core/src/cdm_engine.cpp

@@ -60,11 +60,12 @@ class UsagePropertySet : public CdmClientPropertySet {
 bool CdmEngine::seeded_ = false;
 
 CdmEngine::CdmEngine(FileSystem* file_system, const std::string& spoid)
-    : cert_provisioning_(NULL),
+    : cert_provisioning_(),
       cert_provisioning_requested_security_level_(kLevelDefault),
       file_system_(file_system),
       spoid_(spoid),
-      usage_session_(NULL),
+      usage_session_(),
+      usage_property_set_(),
       last_usage_information_update_time_(0) {
   assert(file_system);
   if (!seeded_) {
@@ -126,7 +127,7 @@ CdmResponseType CdmEngine::OpenSession(
 
   CloseExpiredReleaseSessions();
 
-  scoped_ptr<CdmSession> new_session(new CdmSession(file_system_,
+  std::unique_ptr<CdmSession> new_session(new CdmSession(file_system_,
                                                     metrics_.AddSession()));
   CdmResponseType sts = new_session->Init(property_set, forced_session_id,
                                           event_listener);
@@ -491,7 +492,7 @@ CdmResponseType CdmEngine::QueryStatus(SecurityLevel security_level,
                                        const std::string& query_token,
                                        std::string* query_response) {
   LOGI("CdmEngine::QueryStatus");
-  scoped_ptr<CryptoSession> crypto_session(
+  std::unique_ptr<CryptoSession> crypto_session(
       CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
   CdmResponseType status;
   M_TIME(
@@ -833,7 +834,7 @@ CdmResponseType CdmEngine::HandleProvisioningResponse(
   if (NULL == cert_provisioning_.get()) {
     // Certificate provisioning object has been released. Check if a concurrent
     // provisioning attempt has succeeded before declaring failure.
-    scoped_ptr<CryptoSession> crypto_session(
+    std::unique_ptr<CryptoSession> crypto_session(
         CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
     CdmResponseType status;
     M_TIME(
@@ -889,7 +890,7 @@ bool CdmEngine::IsProvisioned(CdmSecurityLevel security_level) {
 CdmResponseType CdmEngine::Unprovision(CdmSecurityLevel security_level) {
   // Devices with baked-in DRM certs cannot be reprovisioned and therefore must
   // not be unprovisioned.
-  scoped_ptr<CryptoSession> crypto_session(
+  std::unique_ptr<CryptoSession> crypto_session(
       CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
   CdmClientTokenType token_type = kClientTokenUninitialized;
   CdmResponseType res = crypto_session->GetProvisioningMethod(
@@ -923,7 +924,7 @@ CdmResponseType CdmEngine::Unprovision(CdmSecurityLevel security_level) {
 }
 
 CdmResponseType CdmEngine::DeleteUsageTable(CdmSecurityLevel security_level) {
-  scoped_ptr<CryptoSession> crypto_session(
+  std::unique_ptr<CryptoSession> crypto_session(
       CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
   CdmResponseType status;
   M_TIME(
@@ -1006,7 +1007,7 @@ CdmResponseType CdmEngine::DeleteUsageRecord(const std::string& app_id,
   }
 
   // Got provider token. Remove from OEMCrypto.
-  scoped_ptr<CryptoSession> crypto_session(
+  std::unique_ptr<CryptoSession> crypto_session(
       CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
   CdmResponseType status = crypto_session->Open(
       security_level == kSecurityLevelL3 ? kLevel3 : kLevelDefault);
@@ -1215,7 +1216,7 @@ CdmResponseType CdmEngine::RemoveAllUsageInfo(
   }
 
   // Got at least one provider token. Remove from OEMCrypto.
-  scoped_ptr<CryptoSession> crypto_session(
+  std::unique_ptr<CryptoSession> crypto_session(
       CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
   CdmResponseType status = crypto_session->Open(
       security_level == kSecurityLevelL3 ? kLevel3 : kLevelDefault);
@@ -1369,7 +1370,7 @@ CdmResponseType CdmEngine::RemoveUsageInfo(
           handle.DeleteUsageInfo(
               DeviceFiles::GetUsageInfoFileName(app_id),
               provider_session_token);
-          scoped_ptr<CryptoSession> crypto_session(
+          std::unique_ptr<CryptoSession> crypto_session(
               CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
           status = crypto_session->Open(
               static_cast<CdmSecurityLevel>(j) == kSecurityLevelL3
@@ -1807,7 +1808,7 @@ void CdmEngine::DeleteAllUsageReportsUponFactoryReset() {
 
   if (!file_system_->Exists(device_base_path_level1) &&
       !file_system_->Exists(device_base_path_level3)) {
-    scoped_ptr<CryptoSession> crypto_session(
+    std::unique_ptr<CryptoSession> crypto_session(
         CryptoSession::MakeCryptoSession(metrics_.GetCryptoMetrics()));
     CdmResponseType status;
     M_TIME(