Cache the current WebPreferences on RenderViewHostImpl.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 6c87b7a045ccb48a5b7a04e1328cc1570e5e67b1..bbce4de43dd2500094410c4524044732ff217d4b 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -141,9 +141,9 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   virtual RendererPreferences GetRendererPrefs(
       BrowserContext* browser_context) const = 0;
 
-  // Returns a WebPreferences object that will be used by the renderer
+  // Computes a WebPreferences object that will be used by the renderer
   // associated with the owning render view host.
-  virtual WebPreferences GetWebkitPrefs();
+  virtual WebPreferences ComputeWebkitPrefs();
 
   // Notification the user has made a gesture while focus was on the
   // page. This is used to avoid uninitiated user downloads (aka carpet