Add TestBrowserThreadBundle into RenderViewHostTestHarness. Kill some unnecessary real threads.

webkit/appcache/appcache_storage_impl.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 "webkit/appcache/appcache_storage_impl.h"
 
 #include <algorithm>
 #include <functional>
 #include <set>
 #include <vector>
@@ skipping 168 matching lines @@
 };
 
 void AppCacheStorageImpl::DatabaseTask::Schedule() {
   DCHECK(storage_);
   DCHECK(io_thread_->BelongsToCurrentThread());
   if (storage_->db_thread_->PostTask(
       FROM_HERE,
       base::Bind(&DatabaseTask::CallRun, this, base::TimeTicks::Now()))) {
     storage_->scheduled_database_tasks_.push_back(this);
   } else {
-    NOTREACHED() << "The database thread is not running.";
+    NOTREACHED() << "Thread for database tasks is not running. "
+                 << "This is not always the DB thread.";
   }
 }
 
 void AppCacheStorageImpl::DatabaseTask::CancelCompletion() {
   DCHECK(io_thread_->BelongsToCurrentThread());
   delegates_.clear();
   storage_ = NULL;
 }
 
 void AppCacheStorageImpl::DatabaseTask::CallRun(
@@ skipping 1607 matching lines @@
     if (!is_incognito_) {
       VLOG(1) << "Deleting existing appcache data and starting over.";
       db_thread_->PostTask(
           FROM_HERE, base::Bind(base::IgnoreResult(&file_util::Delete),
                                 cache_directory_, true));
     }
   }
 }
 
 }  // namespace appcache