Cleanup namespace ending comment

(This is a merge of http://go/wvgerrit/13400 from the Widevine CDM
repository.)

Replace "};  // namespace" with "}  // namespace":
ag -l --ignore-dir third_party "};  //" | \
while read f; do sed -r -i 's/\};  \/\//}  \/\//' $f ; done

Replace "// unnamed namespace" with "// namespace":
ag -l --ignore-dir third_party "unnamed namespace" | \
while read f; do sed -r -i 's/unnamed namespace/namespace/' $f ; done

Change-Id: I50ece9a127ce669f15cd532dfae1dd741338a075

libwvdrmengine/cdm/core/src/cdm_engine.cpp

@@ -21,7 +21,7 @@
 namespace {
 const uint32_t kUpdateUsageInformationPeriod = 60;  // seconds
 const size_t kUsageReportsPerRequest = 1;
-}  // unnamed namespace
+}  // namespace
 
 namespace wvcdm {
 

libwvdrmengine/cdm/core/src/crypto_session.cpp

@@ -1004,4 +1004,4 @@ bool CryptoSession::GetMaxNumberOfSessions(size_t* max) {
   return true;
 }
 
-};  // namespace wvcdm
+}  // namespace wvcdm

libwvdrmengine/cdm/core/src/device_files.cpp

@@ -55,7 +55,7 @@ bool Hash(const std::string& data, std::string* hash) {
   return true;
 }
 
-}  // unnamed namespace
+}  // namespace
 
 namespace wvcdm {
 

libwvdrmengine/cdm/core/src/oemcrypto_adapter_dynamic.cpp

@@ -503,7 +503,7 @@ bool OEMCrypto_SupportsUsageTable(SecurityLevel level) {
   return fcn->SupportsUsageTable();
 }
 
-};  // namespace wvcdm
+}  // namespace wvcdm
 
 extern "C" OEMCryptoResult OEMCrypto_Initialize(void) {
   if (kAdapter) {

libwvdrmengine/cdm/core/src/string_conversions.cpp

@@ -202,4 +202,4 @@ int64_t ntohll64(int64_t x) {  // Convert from big endian (network-byte-order)
   }
 }
 
-};  // namespace wvcdm
+}  // namespace wvcdm