Remove some unused linked_ptr.h includes in c/b/extensions/api

chrome/browser/extensions/api/input_ime/input_ime_api_nonchromeos.cc

 // Copyright 2015 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.
 
 // This file is for non-chromeos (win & linux) functions, such as
 // chrome.input.ime.activate, chrome.input.ime.createWindow and
 // chrome.input.ime.onSelectionChanged.
 // TODO(azurewei): May refactor the code structure by using delegate or
 // redesign the API to remove this platform-specific file in the future.
 
 #include "chrome/browser/extensions/api/input_ime/input_ime_api.h"
 
 #include "base/command_line.h"
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/input_method/input_method_engine.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/api/input_ime.h"
 #include "extensions/browser/extension_prefs.h"
 #include "ui/base/ime/ime_bridge.h"
 #include "ui/gfx/geometry/rect.h"
 
@@ skipping 372 matching lines @@
     return RespondNow(Error(kErrorNoActiveEngine));
 
   std::unique_ptr<api::input_ime::HideWindow::Params> params(
       api::input_ime::HideWindow::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
   engine->HideImeWindow(params->window_id);
   return RespondNow(NoArguments());
 }
 
 }  // namespace extensions