Fix comment typo.

Review URL: https://chromiumcodereview.appspot.com/10823113

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149284 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/utility/completion_callback_factory_thread_traits.h

@@ -118,7 +118,7 @@ class NonThreadSafeThreadTraits {
 
   /// A simple object that acts like a lock but does nothing.
   ///
-  /// MStrong>Note:</strong> in Debug mode, it checks that it is either
+  /// <strong>Note:</strong> in Debug mode, it checks that it is either
   /// called on the main thread, or always called on another thread. It also
   /// asserts that the caller does not recursively lock.
   class Lock {