MacViews: Gets a webview working in views_examples_with_content_exe

ui/views_content_client/views_content_client_main_parts_mac.mm

 // Copyright 2014 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/files/file_path.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/path_service.h"
+#include "content/public/browser/plugin_service.h"
 #include "content/public/common/content_paths.h"
 #include "content/shell/browser/shell_browser_context.h"
 #include "ui/views_content_client/views_content_client.h"
 #include "ui/views_content_client/views_content_client_main_parts.h"
 
 // A simple NSApplicationDelegate that provides a basic mainMenu and can
 // activate a task when the application has finished loading.
 @interface ViewsContentClientAppController : NSObject<NSApplicationDelegate> {
  @private
   base::Closure task_;
@@ skipping 25 matching lines @@
 };
 
 ViewsContentClientMainPartsMac::ViewsContentClientMainPartsMac(
     const content::MainFunctionParams& content_params,
     ViewsContentClient* views_content_client)
     : ViewsContentClientMainParts(content_params, views_content_client) {
   // Cache the child process path to avoid triggering an AssertIOAllowed.
   base::FilePath child_process_exe;
   PathService::Get(content::CHILD_PROCESS_EXE, &child_process_exe);
 
+  // Disable plugin discovery since NPAPI plugin support on Mac requires this to
+  // be done in a utility process type which isn't bundled with this executable.
+  content::PluginService::GetInstance()->DisablePluginsDiscoveryForTesting();
+
   app_controller_.reset([[ViewsContentClientAppController alloc] init]);
   [[NSApplication sharedApplication] setDelegate:app_controller_];
 }
 
 void ViewsContentClientMainPartsMac::PreMainMessageLoopRun() {
   ViewsContentClientMainParts::PreMainMessageLoopRun();
 
   // On Mac, the task must be deferred to applicationDidFinishLaunching. If not,
   // the widget can activate, but (even if configured) the mainMenu won't be
   // ready to switch over in the OSX UI, so it will look strange.
@@ skipping 44 matching lines @@
   NSString* quitTitle = [@"Quit " stringByAppendingString:appName];
   [appMenu addItemWithTitle:quitTitle
                      action:@selector(terminate:)
               keyEquivalent:@"q"];
   [appMenuItem setSubmenu:appMenu];
 
   task_.Run();
 }
 
 @end