Linux: Fix some NULL versus 0 issues to appease gcc-4.5.

webkit/glue/plugins/pepper_device_context_2d.cc

 // Copyright (c) 2010 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/glue/plugins/pepper_device_context_2d.h"
 
 #include <iterator>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 50 matching lines @@
                       rect->size.width, rect->size.height);
   }
   return true;
 }
 
 PP_Resource Create(PP_Module module_id,
                    const PP_Size* size,
                    bool is_always_opaque) {
   PluginModule* module = PluginModule::FromPPModule(module_id);
   if (!module)
-    return NULL;
+    return 0;
 
   scoped_refptr<DeviceContext2D> context(new DeviceContext2D(module));
   if (!context->Init(size->width, size->height, is_always_opaque))
-    return NULL;
+    return 0;
   return context->GetReference();
 }
 
 bool IsDeviceContext2D(PP_Resource resource) {
   return !!Resource::GetAs<DeviceContext2D>(resource);
 }
 
 bool Describe(PP_Resource device_context,
               PP_Size* size,
               bool* is_always_opaque) {
@@ skipping 458 matching lines @@
   data.Execute(PP_OK);
 }
 
 bool DeviceContext2D::HasPendingFlush() const {
   return !unpainted_flush_callback_.is_null() ||
          !painted_flush_callback_.is_null() ||
          offscreen_flush_pending_;
 }
 
 }  // namespace pepper