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

content/test/mock_render_process.h

Index: content/test/mock_render_process.h
===================================================================
--- content/test/mock_render_process.h	(revision 163290)
+++ content/test/mock_render_process.h	(working copy)
@@ -7,6 +7,7 @@
 
 #include "content/renderer/render_process.h"
 
+namespace content {
 // This class is a mock of the child process singleton which we use during
 // running of the RenderView unit tests.
 class MockRenderProcess : public RenderProcess {
@@ -32,4 +33,6 @@
   DISALLOW_COPY_AND_ASSIGN(MockRenderProcess);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_TEST_MOCK_RENDER_PROCESS_H_