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

content/common/fileapi/webfilewriter_impl.h

Index: content/common/fileapi/webfilewriter_impl.h
===================================================================
--- content/common/fileapi/webfilewriter_impl.h	(revision 163290)
+++ content/common/fileapi/webfilewriter_impl.h	(working copy)
@@ -9,6 +9,8 @@
 #include "base/memory/weak_ptr.h"
 #include "webkit/fileapi/webfilewriter_base.h"
 
+namespace content {
+
 // An implementation of WebFileWriter for use in chrome renderers and workers.
 class WebFileWriterImpl : public fileapi::WebFileWriterBase,
                           public base::SupportsWeakPtr<WebFileWriterImpl> {
@@ -28,4 +30,6 @@
   int request_id_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_FILEAPI_WEBFILEWRITER_IMPL_H_