npapi plugins: Make sure WebPlugin has no key functions on mac.

webkit/plugins/npapi/webplugin_impl.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 "webkit/plugins/npapi/webplugin_impl.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/message_loop.h"
@@ skipping 736 matching lines @@
           if (clients_[i].client)
             clients_[i].client->DidFail();
         }
       }
       break;
     }
   }
 }
 
 #if defined(OS_MACOSX)
+WebPluginAcceleratedSurface* WebPluginImpl::GetAcceleratedSurface(
+    gfx::GpuPreference gpu_preference) {
+  return NULL;
+}
+
 void WebPluginImpl::AcceleratedPluginEnabledRendering() {
 }
 
 void WebPluginImpl::AcceleratedPluginAllocatedIOSurface(int32 width,
                                                         int32 height,
                                                         uint32 surface_id) {
   next_io_surface_allocated_ = true;
   next_io_surface_width_ = width;
   next_io_surface_height_ = height;
   next_io_surface_id_ = surface_id;
@@ skipping 630 matching lines @@
       webframe_->setReferrerForRequest(*request, plugin_url_);
       break;
 
     default:
       break;
   }
 }
 
 }  // namespace npapi
 }  // namespace webkit