Fix //third_party/cec to not disable -Wunused-function.

chrome/browser/printing/print_preview_dialog_controller_browsertest.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/browser/printing/print_preview_dialog_controller.h"
 
 #include <memory>
 
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
@@ skipping 109 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewDialogDestroyedObserver);
 };
 
 void PluginsLoadedCallback(
     const base::Closure& quit_closure,
     const std::vector<content::WebPluginInfo>& /* info */) {
   quit_closure.Run();
 }
 
-void PluginEnabledCallback(const base::Closure& quit_closure, bool can_enable) {
-  EXPECT_TRUE(can_enable);
-  quit_closure.Run();
-}
-
 bool GetPdfPluginInfo(content::WebPluginInfo* info) {
   base::FilePath pdf_plugin_path = base::FilePath::FromUTF8Unsafe(
       ChromeContentClient::kPDFPluginPath);
   return content::PluginService::GetInstance()->GetPluginInfoByPath(
       pdf_plugin_path, info);
 }
 
 const char kDummyPrintUrl[] = "chrome://print/dummy.pdf";
 
 void CountFrames(int* frame_count,
@@ skipping 250 matching lines @@
   content::BrowserAccessibilityState::GetInstance()->EnableAccessibility();
   ui_test_utils::NavigateToURL(browser(), GURL("data:text/html,HelloWorld"));
   PrintPreview();
   WebContents* preview_dialog = GetPrintPreviewDialog();
   WaitForAccessibilityTreeToContainNodeWithName(preview_dialog, "HelloWorld");
 }
 
 }  // namespace
 
 #endif  // defined(ENABLE_TASK_MANAGER)