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

content/test/js_injection_ready_observer.h

Index: content/test/js_injection_ready_observer.h
diff --git a/content/test/js_injection_ready_observer.h b/content/test/js_injection_ready_observer.h
index 8daf7d8baf87db26e672dad0e0ce4048f1d0184f..76370b5dcafabf5c51a3af9fc8cacf60aa01746e 100644
--- a/content/test/js_injection_ready_observer.h
+++ b/content/test/js_injection_ready_observer.h
@@ -6,7 +6,9 @@
 #define CONTENT_TEST_JS_INJECTION_READY_OBSERVER_H_
 #pragma once
 
+namespace content {
 class RenderViewHost;
+}
 
 // Interface to notify when JavaScript injection is possible.
 class JsInjectionReadyObserver {
@@ -14,7 +16,8 @@ class JsInjectionReadyObserver {
   // Called to indicate page entry committed and ready for JavaScript
   // injection. |render_view_host| may be used to route injection messages to
   // the appropriate RenderView.
-  virtual void OnJsInjectionReady(RenderViewHost* render_view_host) = 0;
+  virtual void OnJsInjectionReady(
+      content::RenderViewHost* render_view_host) = 0;
 
  protected:
   virtual ~JsInjectionReadyObserver() {}