Remove the close button in context menu for IME menu.

chrome/common/extensions/extension_constants.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 "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/common/extensions/extension_constants.h"
 
 namespace extension_urls {
 
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 const int kWebstoreSignaturesPublicKeySize =
     arraysize(kWebstoreSignaturesPublicKey);
 
+#if defined(OS_CHROMEOS)
+bool IsImeMenuExtensionId(const std::string& extension_id) {
+  const char* const kImeMenuExtensionIds[] = {
+      "gjaehgfemfahhmlgpdfknkhdnemmolop", "jkghodnilhceideoidjikpgommlajknk"};
+  for (const char* id : kImeMenuExtensionIds) {
+    if (extension_id == id)
+      return true;
+  }
+  return false;
+}
+#endif
 }  // namespace extension_misc