Remove a bunch of trivial render_view_host_delegate.h includes in chrome.

chrome/browser/renderer_host/offline_resource_throttle.cc

Index: chrome/browser/renderer_host/offline_resource_throttle.cc
===================================================================
--- chrome/browser/renderer_host/offline_resource_throttle.cc	(revision 138257)
+++ chrome/browser/renderer_host/offline_resource_throttle.cc	(working copy)
@@ -16,9 +16,9 @@
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
-#include "content/public/browser/render_view_host_delegate.h"
 #include "content/public/browser/resource_context.h"
 #include "content/public/browser/resource_throttle_controller.h"
+#include "content/public/browser/web_contents.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/base/network_change_notifier.h"
@@ -48,7 +48,7 @@
     RenderViewHost* render_view_host =
         RenderViewHost::FromID(render_process_id, render_view_id);
     WebContents* web_contents = render_view_host ?
-        render_view_host->GetDelegate()->GetAsWebContents() : NULL;
+        WebContents::FromRenderViewHost(render_view_host) : NULL;
     // There is a chance that the tab closed after we decided to show
     // the offline page on the IO thread and before we actually show the
     // offline page here on the UI thread.