Move Render(View|Widget)Host and associated classes to content namespace.

content/public/browser/devtools_agent_host_registry.h

Index: content/public/browser/devtools_agent_host_registry.h
diff --git a/content/public/browser/devtools_agent_host_registry.h b/content/public/browser/devtools_agent_host_registry.h
index 404a5cbb099c44dfe2ae198c4a8c50aa99b26d85..147c3bda96bbeb51a80138cc2adf4ccc851182f3 100644
--- a/content/public/browser/devtools_agent_host_registry.h
+++ b/content/public/browser/devtools_agent_host_registry.h
@@ -8,11 +8,10 @@
 
 #include "content/common/content_export.h"
 
-class RenderViewHost;
-
 namespace content {
 
 class DevToolsAgentHost;
+class RenderViewHost;
 class WebContents;
 
 class CONTENT_EXPORT DevToolsAgentHostRegistry {
@@ -22,7 +21,8 @@ class CONTENT_EXPORT DevToolsAgentHostRegistry {
   static DevToolsAgentHost* GetDevToolsAgentHost(RenderViewHost* rvh);
 
   // Returns render view host instance for given |agent_host|.
-  static RenderViewHost* GetRenderViewHost(DevToolsAgentHost* agent_host);
+  static RenderViewHost* GetRenderViewHost(
+      DevToolsAgentHost* agent_host);
 
   // Returns true iff an instance of DevToolsAgentHost for the |rvh|
   // does exist.