Move RenderViewHostObserver to content/public/browser/ and put it into the content namespace.

chrome/browser/renderer_host/chrome_render_view_host_observer.h

Index: chrome/browser/renderer_host/chrome_render_view_host_observer.h
diff --git a/chrome/browser/renderer_host/chrome_render_view_host_observer.h b/chrome/browser/renderer_host/chrome_render_view_host_observer.h
index 7fac8fee594d043c6e5acfd847e2f177ea1d2634..5a933e04ddffede51313771c312d592cd3cb1cd8 100644
--- a/chrome/browser/renderer_host/chrome_render_view_host_observer.h
+++ b/chrome/browser/renderer_host/chrome_render_view_host_observer.h
@@ -6,7 +6,7 @@
 #define CHROME_BROWSER_RENDERER_HOST_CHROME_RENDER_VIEW_HOST_OBSERVER_H_
 #pragma once
 
-#include "content/browser/renderer_host/render_view_host_observer.h"
+#include "content/public/browser/render_view_host_observer.h"
 
 namespace chrome_browser_net {
 class Predictor;
@@ -17,13 +17,13 @@ class Profile;
 
 // This class holds the Chrome specific parts of RenderViewHost, and has the
 // same lifetime.
-class ChromeRenderViewHostObserver : public RenderViewHostObserver {
+class ChromeRenderViewHostObserver : public content::RenderViewHostObserver {
  public:
   ChromeRenderViewHostObserver(RenderViewHost* render_view_host,
                                chrome_browser_net::Predictor* predictor);
   virtual ~ChromeRenderViewHostObserver();
 
-  // RenderViewHostObserver overrides.
+  // content::RenderViewHostObserver overrides.
   virtual void RenderViewHostInitialized() OVERRIDE;
   virtual void RenderViewHostDestroyed(RenderViewHost* rvh) OVERRIDE;
   virtual void Navigate(const GURL& url) OVERRIDE;