Try to fix 10.6 build after clang revert.

webkit/plugins/npapi/plugin_web_event_converter_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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "webkit/plugins/npapi/plugin_web_event_converter_mac.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 
@@ skipping 191 matching lines @@
 
   cocoa_event_.data.key.modifierFlags |= CocoaModifiers(key_event);
 
   // Modifier keys have their own event type, and don't get character or
   // repeat data.
   if (KeyIsModifier(key_event.nativeKeyCode)) {
     cocoa_event_.type = NPCocoaEventFlagsChanged;
     return true;
   }
 
+  // TODO(thakis): Remove this once clang is smarter, http://crbug.com/111861
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wformat"
   cocoa_event_.data.key.characters = reinterpret_cast<NPNSString*>(
       [NSString stringWithFormat:@"%S", key_event.text]);
   cocoa_event_.data.key.charactersIgnoringModifiers =
       reinterpret_cast<NPNSString*>(
           [NSString stringWithFormat:@"%S", key_event.unmodifiedText]);
+#pragma clang diagnostic pop
 
   if (key_event.modifiers & WebInputEvent::IsAutoRepeat)
     cocoa_event_.data.key.isARepeat = true;
 
   switch (key_event.type) {
     case WebInputEvent::KeyDown:
       cocoa_event_.type = NPCocoaEventKeyDown;
       return true;
     case WebInputEvent::KeyUp:
       cocoa_event_.type = NPCocoaEventKeyUp;
@@ skipping 129 matching lines @@
       return new CarbonPluginWebEventConverter();
 #endif
     default:
       NOTIMPLEMENTED();
       return NULL;
   }
 }
 
 }  // namespace npapi
 }  // namespace webkit