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

content/content_browser.gypi

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'dependencies': [
     '../crypto/crypto.gyp:crypto',
     '../net/net.gyp:net',
     '../net/net.gyp:http_server',
     '../ppapi/ppapi_internal.gyp:ppapi_proxy',
@@ skipping 25 matching lines @@
     'public/browser/notification_details.h',
     'public/browser/notification_observer.h',
     'public/browser/notification_registrar.cc',
     'public/browser/notification_registrar.h',
     'public/browser/notification_service.h',
     'public/browser/notification_source.h',
     'public/browser/notification_types.h',
     'public/browser/plugin_data_remover.h',
     'public/browser/render_process_host.h',
     'public/browser/render_process_host_factory.h',
+    'public/browser/render_view_host_observer.cc',
+    'public/browser/render_view_host_observer.h',
     'public/browser/resource_dispatcher_host_delegate.h',
     'browser/accessibility/browser_accessibility.cc',
     'browser/accessibility/browser_accessibility.h',
     'browser/accessibility/browser_accessibility_cocoa.h',
     'browser/accessibility/browser_accessibility_cocoa.mm',
     'browser/accessibility/browser_accessibility_delegate_mac.h',
     'browser/accessibility/browser_accessibility_mac.h',
     'browser/accessibility/browser_accessibility_mac.mm',
     'browser/accessibility/browser_accessibility_manager.cc',
     'browser/accessibility/browser_accessibility_manager.h',
@@ skipping 373 matching lines @@
     'browser/renderer_host/render_process_host_impl.h',
     'browser/renderer_host/render_sandbox_host_linux.cc',
     'browser/renderer_host/render_sandbox_host_linux.h',
     'browser/renderer_host/render_view_host.cc',
     'browser/renderer_host/render_view_host.h',
     'browser/renderer_host/render_view_host_delegate.cc',
     'browser/renderer_host/render_view_host_delegate.h',
     'browser/renderer_host/render_view_host_factory.cc',
     'browser/renderer_host/render_view_host_factory.h',
     'browser/renderer_host/render_view_host_notification_task.h',
-    'browser/renderer_host/render_view_host_observer.cc',
-    'browser/renderer_host/render_view_host_observer.h',
     'browser/renderer_host/render_widget_fullscreen_host.cc',
     'browser/renderer_host/render_widget_fullscreen_host.h',
     'browser/renderer_host/render_widget_helper.cc',
     'browser/renderer_host/render_widget_helper.h',
     'browser/renderer_host/render_widget_host.cc',
     'browser/renderer_host/render_widget_host.h',
     'browser/renderer_host/render_widget_host_gtk.cc',
     'browser/renderer_host/render_widget_host_mac.cc',
     'browser/renderer_host/render_widget_host_view.cc',
     'browser/renderer_host/render_widget_host_view.h',
@@ skipping 335 matching lines @@
         'browser/renderer_host/java/java_bridge_dispatcher_host_manager.h',
         'browser/renderer_host/java/java_bridge_dispatcher_host.cc',
         'browser/renderer_host/java/java_bridge_dispatcher_host.h',
         'browser/renderer_host/java/java_method.cc',
         'browser/renderer_host/java/java_method.h',
       ],
     }],
   ],
 }