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/include/cdm_engine.h

@@ -19,7 +19,6 @@
 #include "lock.h"
 #include "metrics_collections.h"
 #include "oemcrypto_adapter.h"
-#include "scoped_ptr.h"
 #include "service_certificate.h"
 #include "wv_cdm_constants.h"
 #include "wv_cdm_types.h"
@@ -325,7 +324,7 @@ class CdmEngine {
 
   CdmSessionMap session_map_;
   CdmReleaseKeySetMap release_key_sets_;
-  scoped_ptr<CertificateProvisioning> cert_provisioning_;
+  std::unique_ptr<CertificateProvisioning> cert_provisioning_;
   SecurityLevel cert_provisioning_requested_security_level_;
   FileSystem* file_system_;
   Clock clock_;
@@ -334,8 +333,8 @@ class CdmEngine {
   static bool seeded_;
 
   // usage related variables
-  scoped_ptr<CdmSession> usage_session_;
-  scoped_ptr<UsagePropertySet> usage_property_set_;
+  std::unique_ptr<CdmSession> usage_session_;
+  std::unique_ptr<UsagePropertySet> usage_property_set_;
   int64_t last_usage_information_update_time_;
 
   // Protect release_key_sets_ from non-thread-safe operations.