clang/win: Let some chromium_code targets build with -Wextra.

ui/base/ime/remote_input_method_win.cc

 // Copyright 2013 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 "ui/base/ime/remote_input_method_win.h"
 
 #include "base/command_line.h"
 #include "base/observer_list.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/metro.h"
@@ skipping 42 matching lines @@
     g_private_interface_ = NULL;
   }
 }
 
 std::string GetLocaleString(LCID Locale_id, LCTYPE locale_type) {
   wchar_t buffer[16] = {};
 
   //|chars_written| includes NUL terminator.
   const int chars_written =
       GetLocaleInfo(Locale_id, locale_type, buffer, arraysize(buffer));
-  if (chars_written <= 1 || arraysize(buffer) < chars_written)
+  if (chars_written <= 1 || static_cast<int>(arraysize(buffer)) < chars_written)
     return std::string();
   std::string result;
   base::WideToUTF8(buffer, chars_written - 1, &result);
   return result;
 }
 
 std::vector<int32> GetInputScopesAsInt(TextInputType text_input_type,
                                        TextInputMode text_input_mode) {
   std::vector<int32> result;
   // An empty vector represents |text_input_type| is TEXT_INPUT_TYPE_NONE.
@@ skipping 300 matching lines @@
   return make_scoped_ptr(new RemoteInputMethodWin(delegate));
 }
 
 // static
 RemoteInputMethodPrivateWin* RemoteInputMethodPrivateWin::Get(
     InputMethod* input_method) {
   return GetPrivate(input_method);
 }
 
 }  // namespace ui