Try to fix 10.6 build after clang revert.

content/renderer/render_view_browsertest_mac.mm

 // 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/string_util.h"
 #include "base/string16.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/test/render_view_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include <Cocoa/Cocoa.h>
 #include <Carbon/Carbon.h>  // for the kVK_* constants.
 
 using content::RenderViewTest;
 
 NSEvent* CmdDeadKeyEvent(NSEventType type, unsigned short code) {
   UniChar uniChar = 0;
   switch(code) {
     case kVK_UpArrow:
       uniChar = NSUpArrowFunctionKey;
       break;
     case kVK_DownArrow:
       uniChar = NSDownArrowFunctionKey;
       break;
     default:
       CHECK(false);
   }
+  // TODO(thakis): Remove this once clang is smarter, http://crbug.com/111861
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat"
   NSString* s = [NSString stringWithFormat:@"%C", uniChar];
+#pragma clang diagnostic pop
 
   return [NSEvent keyEventWithType:type
                           location:NSMakePoint(0, 0)
                      modifierFlags:NSCommandKeyMask
                          timestamp:0.0
                       windowNumber:0
                            context:nil
                         characters:s
        charactersIgnoringModifiers:s
                          isARepeat:NO
@@ skipping 99 matching lines @@
   const char* kArrowUpNoScroll =
       "38,false,false,true,false\np1\n\np2";
   view->OnSetEditCommandsForNextKeyEvent(
       EditCommands(1, EditCommand("moveToBeginningOfDocument", "")));
   SendNativeKeyEvent(NativeWebKeyboardEvent(arrowUpKeyDown));
   ProcessPendingMessages();
   output = GetMainFrame()->contentAsText(kMaxOutputCharacters);
   EXPECT_EQ(kArrowUpNoScroll, UTF16ToASCII(output));
 }