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/src/clock.cpp

@@ -15,5 +15,4 @@ int64_t Clock::GetCurrentTime() {
   return tv.tv_sec;
 }
 
-
-};  // namespace wvcdm
+}  // namespace wvcdm

libwvdrmengine/cdm/src/lock.cpp

@@ -31,6 +31,6 @@ bool Lock::Try() {
   return (impl_->lock_.tryLock() == 0);
 }
 
-};  // namespace wvcdm
+}  // namespace wvcdm
 
 

libwvdrmengine/cdm/src/log.cpp

@@ -52,4 +52,4 @@ void Log(const char* file, int line, LogPriority level, const char* fmt, ...) {
   __android_log_write(prio, LOG_TAG, buf);
 }
 
-};  // namespace wvcdm
+}  // namespace wvcdm