Disable MediaGalleriesPrivateApiTest.DeviceAttachDetachEvents on Linux official bot.

chrome/browser/extensions/api/media_galleries_private/media_galleries_private_apitest.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 "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
@@ skipping 88 matching lines @@
     StorageMonitor::GetInstance()->receiver()->ProcessDetach(device_id_);
     content::RunAllPendingInMessageLoop();
   }
 
  private:
   std::string device_id_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaGalleriesPrivateApiTest);
 };
 
-IN_PROC_BROWSER_TEST_F(MediaGalleriesPrivateApiTest, DeviceAttachDetachEvents) {
+// Fails on official Linux bot. See http://crbug.com/315276
+#if defined(GOOGLE_CHROME_BUILD) && defined(OS_LINUX)
+#define MAYBE_DeviceAttachDetachEvents DISABLED_DeviceAttachDetachEvents
+#else
+#define MAYBE_DeviceAttachDetachEvents DeviceAttachDetachEvents
+#endif
+IN_PROC_BROWSER_TEST_F(MediaGalleriesPrivateApiTest,
+                       MAYBE_DeviceAttachDetachEvents) {
   // Setup.
   TestStorageMonitor::SyncInitialize();
   const extensions::Extension* extension =
       LoadExtension(test_data_dir_.AppendASCII(kTestExtensionPath));
   ASSERT_TRUE(extension);
 
   content::RenderViewHost* host =
       extensions::ExtensionSystem::Get(browser()->profile())->
           process_manager()->GetBackgroundHostForExtension(extension->id())->
               render_view_host();
@@ skipping 55 matching lines @@
   Attach();
   EXPECT_TRUE(attach_finished_listener.WaitUntilSatisfied());
   Detach();
   EXPECT_TRUE(detach_finished_listener.WaitUntilSatisfied());
 
   Attach();
   EXPECT_TRUE(attach_finished_listener.WaitUntilSatisfied());
   Detach();
   EXPECT_TRUE(detach_finished_listener.WaitUntilSatisfied());
 }