Add NULL-checks to plugin delegate message handlers

chrome/plugin/webplugin_delegate_stub.cc

 // Copyright (c) 2009 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 "chrome/plugin/webplugin_delegate_stub.h"
 
 #include "build/build_config.h"
 
 #include "base/command_line.h"
 #include "chrome/common/child_process_logging.h"
@@ skipping 319 matching lines @@
 }
 
 void WebPluginDelegateStub::OnSendJavaScriptStream(const GURL& url,
                                                    const std::string& result,
                                                    bool success,
                                                    int notify_id) {
   delegate_->SendJavaScriptStream(url, result, success, notify_id);
 }
 
 void WebPluginDelegateStub::OnSetContentAreaFocus(bool has_focus) {
-  delegate_->SetContentAreaHasFocus(has_focus);
+  if (delegate_)
+    delegate_->SetContentAreaHasFocus(has_focus);
 }
 
 #if defined(OS_MACOSX)
 void WebPluginDelegateStub::OnSetWindowFocus(bool has_focus) {
-  delegate_->SetWindowHasFocus(has_focus);
+  if (delegate_)
+    delegate_->SetWindowHasFocus(has_focus);
 }
 
 void WebPluginDelegateStub::OnContainerHidden() {
-  delegate_->SetContainerVisibility(false);
+  if (delegate_)
+    delegate_->SetContainerVisibility(false);
 }
 
 void WebPluginDelegateStub::OnContainerShown(gfx::Rect window_frame,
                                              gfx::Rect view_frame,
                                              bool has_focus) {
-  delegate_->WindowFrameChanged(window_frame, view_frame);
-  delegate_->SetContainerVisibility(true);
-  delegate_->SetWindowHasFocus(has_focus);
+  if (delegate_) {
+    delegate_->WindowFrameChanged(window_frame, view_frame);
+    delegate_->SetContainerVisibility(true);
+    delegate_->SetWindowHasFocus(has_focus);
+  }
 }
 
 void WebPluginDelegateStub::OnWindowFrameChanged(const gfx::Rect& window_frame,
                                                  const gfx::Rect& view_frame) {
-  delegate_->WindowFrameChanged(window_frame, view_frame);
+  if (delegate_)
+    delegate_->WindowFrameChanged(window_frame, view_frame);
 }
 #endif  // OS_MACOSX
 
 void WebPluginDelegateStub::OnDidReceiveManualResponse(
     const GURL& url,
     const PluginMsg_DidReceiveResponseParams& params) {
   delegate_->DidReceiveManualResponse(url, params.mime_type, params.headers,
                                       params.expected_length,
                                       params.last_modified);
 }
@@ skipping 84 matching lines @@
   webplugin_->OnResourceCreated(resource_id, resource_client);
 }
 
 #if defined(OS_MACOSX)
 void WebPluginDelegateStub::OnSetFakeAcceleratedSurfaceWindowHandle(
     gfx::PluginWindowHandle window) {
   delegate_->set_windowed_handle(window);
 }
 #endif