Don't serialize extension user script injection results unless the extension

chrome/renderer/extensions/chrome_v8_context_set.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_CHROME_V8_CONTEXT_SET_H_
 #define CHROME_RENDERER_EXTENSIONS_CHROME_V8_CONTEXT_SET_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "v8/include/v8.h"
 
 class GURL;
 
 namespace base {
 class ListValue;
 }
 
 namespace content {
 class RenderView;
 }
 
+namespace WebKit {
+class WebFrame;
+}
+
 namespace v8 {
 class Context;
 }
 
 namespace extensions {
 class ChromeV8Context;
 
 // A container of ExtensionBindingsContext. Since calling JavaScript within a
 // context can cause any number of contexts to be created or destroyed, this
 // has additional smarts to help with the set changing underneath callers.
@@ skipping 21 matching lines @@
   ChromeV8Context* GetCurrent() const;
 
   // Gets the ChromeV8Context corresponding to v8::Context::GetCalling(), or
   // NULL if no such context exists.
   ChromeV8Context* GetCalling() const;
 
   // Gets the ChromeV8Context corresponding to the specified
   // v8::Context or NULL if no such context exists.
   ChromeV8Context* GetByV8Context(v8::Handle<v8::Context> context) const;
 
+  // Gets the ChromeV8Context corresponding to the given WebFrame.
+  ChromeV8Context* GetByWebFrame(WebKit::WebFrame* web_frame) const;

[not at google - send to devlin, 2013/08/23 01:19:13]

Ok this method doesn't make any sense. There are multiple contexts per frame.
Don't know what I was thinking. Will fix tomorrow.

+
   // Synchronously runs |callback| with each ChromeV8Context that belongs to
   // |extension_id| in |render_view|.
   //
   // |extension_id| may be "" to match all extensions.
   // |render_view| may be NULL to match all render views.
   void ForEach(const std::string& extension_id,
                content::RenderView* render_view,
                const base::Callback<void(ChromeV8Context*)>& callback) const;
 
   // Cleans up contexts belonging to an unloaded extension.
   //
   // Returns the set of ChromeV8Contexts that were removed as a result. These
   // are safe to interact with until the end of the current event loop, since
   // they're deleted asynchronously.
   ContextSet OnExtensionUnloaded(const std::string& extension_id);
 
  private:
   ContextSet contexts_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeV8ContextSet);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_CHROME_V8_CONTEXT_SET_H_