linux and chromeos: Turn on -Wunused-const-variable.

chrome/browser/extensions/api/input_ime/input_ime_api.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/extensions/api/input_ime/input_ime_api.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/input_method/input_method_engine.h"
@@ skipping 16 matching lines @@
 namespace SetCandidates = extensions::api::input_ime::SetCandidates;
 namespace SetCandidateWindowProperties =
     extensions::api::input_ime::SetCandidateWindowProperties;
 namespace CommitText = extensions::api::input_ime::CommitText;
 namespace ClearComposition = extensions::api::input_ime::ClearComposition;
 namespace SetComposition = extensions::api::input_ime::SetComposition;
 
 namespace {
 
 const char kErrorEngineNotAvailable[] = "Engine is not available";
-const char kErrorBadCandidateList[] = "Invalid candidate list provided";
 const char kErrorSetMenuItemsFail[] = "Could not create menu Items";
 const char kErrorUpdateMenuItemsFail[] = "Could not update menu Items";
 
 void SetMenuItemToMenu(const input_ime::MenuItem& input,
                        chromeos::InputMethodEngine::MenuItem* out) {
   out->modified = 0;
   out->id = input.id;
   if (input.label) {
     out->modified |= chromeos::InputMethodEngine::MENU_ITEM_MODIFIED_LABEL;
     out->label = *input.label;
@@ skipping 717 matching lines @@
     if (input_components->size() > 0)
       input_ime_event_router()->UnregisterAllImes(profile_, extension->id());
   }
 }
 
 InputImeEventRouter* InputImeAPI::input_ime_event_router() {
   return InputImeEventRouter::GetInstance();
 }
 
 }  // namespace extensions