Move a bunch of code in content\common (as well as a few left in renderer) to the content namespace.

content/common/gpu/sync_point_manager.h

Index: content/common/gpu/sync_point_manager.h
===================================================================
--- content/common/gpu/sync_point_manager.h	(revision 163290)
+++ content/common/gpu/sync_point_manager.h	(working copy)
@@ -13,6 +13,8 @@
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 
+namespace content {
+
 // This class manages the sync points, which allow cross-channel
 // synchronization.
 class SyncPointManager : public base::RefCountedThreadSafe<SyncPointManager> {
@@ -51,4 +53,6 @@
   DISALLOW_COPY_AND_ASSIGN(SyncPointManager);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_GPU_SYNC_POINT_MANAGER_H_