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

content/common/fileapi/webblobregistry_impl.h

Index: content/common/fileapi/webblobregistry_impl.h
===================================================================
--- content/common/fileapi/webblobregistry_impl.h	(revision 163290)
+++ content/common/fileapi/webblobregistry_impl.h	(working copy)
@@ -7,13 +7,14 @@
 
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebBlobRegistry.h"
 
-class ChildThread;
-
 namespace WebKit {
 class WebBlobData;
 class WebURL;
 }
 
+namespace content {
+class ChildThread;
+
 class WebBlobRegistryImpl : public WebKit::WebBlobRegistry {
  public:
   explicit WebBlobRegistryImpl(ChildThread* child_thread);
@@ -30,4 +31,6 @@
   ChildThread* child_thread_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_FILEAPI_WEBBLOBREGISTRY_IMPL_H_