Make MessagingBindings use ScriptContextSet::ForEach

extensions/renderer/script_context_set.h

 // 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.
 
 #ifndef EXTENSIONS_RENDERER_SCRIPT_CONTEXT_SET_H_
 #define EXTENSIONS_RENDERER_SCRIPT_CONTEXT_SET_H_
 
 #include <set>
 #include <string>
 
@@ skipping 48 matching lines @@
   // NULL if no such context exists.
   ScriptContext* GetCalling() const;
 
   // Gets the ScriptContext corresponding to the specified
   // v8::Context or NULL if no such context exists.
   ScriptContext* GetByV8Context(v8::Handle<v8::Context> context) const;
 
   // Synchronously runs |callback| with each ScriptContext 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.
+  // An empty |extension_id| will match all extensions, and a NULL |render_view|
+  // will match all render views, but try to use the inline variants of these
+  // methods instead.
   void ForEach(const std::string& extension_id,
                content::RenderView* render_view,
                const base::Callback<void(ScriptContext*)>& callback) const;
+  // ForEach which matches all extensions.
+  void ForEach(content::RenderView* render_view,
+               const base::Callback<void(ScriptContext*)>& callback) const {
+    ForEach("", render_view, callback);
+  }
+  // ForEach which matches all render views.
+  void ForEach(const std::string& extension_id,
+               const base::Callback<void(ScriptContext*)>& callback) const {
+    ForEach(extension_id, NULL, callback);
+  }
 
   // Cleans up contexts belonging to an unloaded extension.
   //
   // Returns the set of ScriptContexts 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(ScriptContextSet);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_SCRIPT_CONTEXT_SET_H_