Move BrowserMessageFilter to public, and into content namespace.

content/browser/renderer_host/render_view_host.cc

Index: content/browser/renderer_host/render_view_host.cc
diff --git a/content/browser/renderer_host/render_view_host.cc b/content/browser/renderer_host/render_view_host.cc
index 4ff4c11e1ded4a75b4881e827ac8972b7341c3e8..9cedac46fbd4c9e0814bc8bcfc3d3b62abc7b5d1 100644
--- a/content/browser/renderer_host/render_view_host.cc
+++ b/content/browser/renderer_host/render_view_host.cc
@@ -17,7 +17,6 @@
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
-#include "content/browser/browser_message_filter.h"
 #include "content/browser/child_process_security_policy.h"
 #include "content/browser/cross_site_request_manager.h"
 #include "content/browser/host_zoom_map.h"
@@ -34,6 +33,7 @@
 #include "content/common/swapped_out_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_message_filter.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/notification_details.h"
@@ -54,6 +54,7 @@
 #include "webkit/glue/webdropdata.h"
 
 using base::TimeDelta;
+using content::BrowserMessageFilter;
 using content::BrowserThread;
 using content::UserMetricsAction;
 using WebKit::WebConsoleMessage;