Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

chrome/browser/media_galleries/media_galleries_test_util.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 "chrome/browser/media_galleries/media_galleries_test_util.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
+#include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 50 matching lines @@
     : num_galleries_(0) {
   Init();
 }
 
 void EnsureMediaDirectoriesExists::Init() {
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
   return;
 #else
   ASSERT_TRUE(fake_dir_.CreateUniqueTempDir());
 
+#if defined(OS_WIN)
+  DCHECK_EQ(0U, fake_dir_.path().value().find(FILE_PATH_LITERAL("C:")))
+      << "TestVolumeMountWatcherWin requries fake_dir to be on C: "
+      << "(note the capital). You have: " << fake_dir_.path().AsUTF8Unsafe()
+      << ".  Check your TMP enviornment variable.";
+#endif
+
   const int kDirectoryKeys[] = {
     chrome::DIR_USER_MUSIC,
     chrome::DIR_USER_PICTURES,
     chrome::DIR_USER_VIDEOS,
   };
 
   const char* kDirectoryNames[] = {
     "music",
     "pictures",
     "videos",
   };
 
   for (size_t i = 0; i < arraysize(kDirectoryKeys); ++i) {
     PathService::OverrideAndCreateIfNeeded(
         kDirectoryKeys[i], fake_dir_.path().AppendASCII(kDirectoryNames[i]),
         true /*create*/);
     base::FilePath path;
     if (PathService::Get(kDirectoryKeys[i], &path) &&
         file_util::DirectoryExists(path)) {
       ++num_galleries_;
     }
   }
   ASSERT_GT(num_galleries_, 0);
 #endif
 }
 
 }  // namespace chrome