Move a bunch of code in content\renderer to the content namespace.

content/renderer/webplugin_delegate_proxy.h

Index: content/renderer/webplugin_delegate_proxy.h
===================================================================
--- content/renderer/webplugin_delegate_proxy.h	(revision 163045)
+++ content/renderer/webplugin_delegate_proxy.h	(working copy)
@@ -30,7 +30,6 @@
 class NPObjectStub;
 class PluginChannelHost;
 struct PluginHostMsg_URLRequest_Params;
-class RenderViewImpl;
 class SkBitmap;
 
 namespace base {
@@ -47,6 +46,9 @@
 }
 }
 
+namespace content {
+class RenderViewImpl;
+
 // An implementation of WebPluginDelegate that proxies all calls to
 // the plugin process.
 class WebPluginDelegateProxy
@@ -327,4 +329,6 @@
   DISALLOW_COPY_AND_ASSIGN(WebPluginDelegateProxy);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_