Remove the close button in context menu for IME menu.

chrome/common/extensions/extension_constants.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 203 matching lines @@
 // Path to preinstalled speech synthesis extension.
 extern const char kSpeechSynthesisExtensionPath[];
 // The extension id of the speech synthesis extension.
 extern const char kSpeechSynthesisExtensionId[];
 // The extension id of the wallpaper manager application.
 extern const char kWallpaperManagerId[];
 // The app id of the webstore widget component app.
 extern const char kWebstoreWidgetAppId[];
 // The extension id of the new ZIP unpacker extension.
 extern const char kZIPUnpackerExtensionId[];
+// The extension id of the IME extensions.

[Devlin, 2016/01/20 23:52:18]

can we be slightly more specific?  IME extensions aren't only limited to these
in chrome.

[Azure Wei, 2016/01/21 04:44:54]

I've updated the document, hope it describes better.

+extern const char* const kIMEExtensionIds[2];
 #endif
 
 // What causes an extension to be installed? Used in histograms, so don't
 // change existing values.
 enum CrxInstallCause {
   INSTALL_CAUSE_UNSET = 0,
   INSTALL_CAUSE_USER_DOWNLOAD,
   INSTALL_CAUSE_UPDATE,
   INSTALL_CAUSE_EXTERNAL_FILE,
   INSTALL_CAUSE_AUTOMATION,
@@ skipping 12 matching lines @@
 // The path part of the file system url used for media file systems.
 extern const char kMediaFileSystemPathPart[];
 
 // The key used for signing some pieces of data from the webstore.
 extern const uint8_t kWebstoreSignaturesPublicKey[];
 extern const int kWebstoreSignaturesPublicKeySize;
 
 }  // namespace extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_