Cleanup: Remove unused variables in chrome/ found by Scythe.

chrome/renderer/extensions/webstore_bindings.cc

 // 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.
 
 #include "chrome/renderer/extensions/webstore_bindings.h"
 
 #include "base/strings/string_util.h"
 #include "chrome/common/extensions/api/webstore/webstore_api_constants.h"
 #include "chrome/common/extensions/chrome_extension_messages.h"
 #include "components/crx_file/id_util.h"
@@ skipping 32 matching lines @@
     "Invalid Chrome Web Store item URL.";
 
 // chrome.webstore.install() calls generate an install ID so that the install's
 // callbacks may be fired when the browser notifies us of install completion
 // (successful or not) via OnInlineWebstoreInstallResponse.
 int g_next_install_id = 0;
 
 } // anonymous namespace
 
 WebstoreBindings::WebstoreBindings(ScriptContext* context)
-    : ObjectBackedNativeHandler(context), ChromeV8ExtensionHandler(context) {
+    : ObjectBackedNativeHandler(context) {
   RouteFunction("Install",
                 base::Bind(&WebstoreBindings::Install, base::Unretained(this)));
 }
 
 void WebstoreBindings::Install(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   content::RenderView* render_view = context()->GetRenderView();
   if (!render_view)
     return;
 
@@ skipping 182 matching lines @@
   v8::Isolate* isolate = context()->isolate();
   v8::HandleScope handle_scope(isolate);
   v8::Context::Scope context_scope(context()->v8_context());
   v8::Handle<v8::Value> argv[] = {
       v8::Number::New(isolate, percent_downloaded / 100.0)};
   context()->module_system()->CallModuleMethod(
       "webstore", "onDownloadProgress", arraysize(argv), argv);
 }
 
 }  // namespace extensions