Introduce HostID and de-couple Extensions from "script injection System" [browser side]

extensions/renderer/user_script_set.cc

 // Copyright 2014 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.
 
 #include "extensions/renderer/user_script_set.h"
 
 #include "content/public/common/url_constants.h"
 #include "content/public/renderer/render_thread.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
@@ skipping 35 matching lines @@
 
 void UserScriptSet::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void UserScriptSet::GetActiveExtensionIds(
     std::set<std::string>* ids) const {
   for (ScopedVector<UserScript>::const_iterator iter = scripts_.begin();
        iter != scripts_.end();
        ++iter) {
-    DCHECK(!(*iter)->extension_id().empty());
-    ids->insert((*iter)->extension_id());
+    DCHECK(!(*iter)->GetExtensionID().empty());
+    ids->insert((*iter)->GetExtensionID());
   }
 }
 
 void UserScriptSet::GetInjections(
     ScopedVector<ScriptInjection>* injections,
     blink::WebFrame* web_frame,
     int tab_id,
     UserScript::RunLocation run_location) {
   GURL document_url = GetDocumentUrlForFrame(web_frame);
   for (ScopedVector<UserScript>::const_iterator iter = scripts_.begin();
        iter != scripts_.end();
        ++iter) {
-    const Extension* extension = extensions_->GetByID((*iter)->extension_id());
+    const Extension* extension =
+        extensions_->GetByID((*iter)->GetExtensionID());
     if (!extension)
       continue;
     scoped_ptr<ScriptInjection> injection = GetInjectionForScript(
         *iter,
         web_frame,
         tab_id,
         run_location,
         document_url,
         extension,
         false /* is_declarative */);
@@ skipping 131 matching lines @@
         injector.Pass(),
         web_frame->toWebLocalFrame(),
         extension->id(),
         run_location,
         tab_id));
   }
   return injection.Pass();
 }
 
 }  // namespace extensions