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

content/common/gpu/gpu_memory_allocation.h

Index: content/common/gpu/gpu_memory_allocation.h
===================================================================
--- content/common/gpu/gpu_memory_allocation.h	(revision 163290)
+++ content/common/gpu/gpu_memory_allocation.h	(working copy)
@@ -7,6 +7,8 @@
 
 #include "base/basictypes.h"
 
+namespace content {
+
 // These are per context memory allocation limits set by the GpuMemoryManager
 // and assigned to the browser and renderer context.
 // They will change over time, given memory availability, and browser state.
@@ -122,4 +124,6 @@
   }
 };
 
+}  // namespace content
+
 #endif // CONTENT_COMMON_GPU_GPU_MEMORY_ALLOCATION_H_