Revert "Currently, base/timer.cc calls PostTask with FROM_HERE as the Location,

net/disk_cache/disk_cache_test_util.cc

 // Copyright (c) 2011 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 "net/disk_cache/disk_cache_test_util.h"
 
 #include "base/logging.h"
 #include "base/file_util.h"
 #include "base/message_loop_proxy.h"
 #include "base/path_service.h"
@@ skipping 123 matching lines @@
 MessageLoopHelper::~MessageLoopHelper() {
 }
 
 bool MessageLoopHelper::WaitUntilCacheIoFinished(int num_callbacks) {
   if (num_callbacks == callbacks_called_)
     return true;
 
   ExpectCallbacks(num_callbacks);
   // Create a recurrent timer of 50 mS.
   if (!timer_.IsRunning())
-    timer_.Start(FROM_HERE, TimeDelta::FromMilliseconds(50), this,
+    timer_.Start(TimeDelta::FromMilliseconds(50), this,
                  &MessageLoopHelper::TimerExpired);
   MessageLoop::current()->Run();
   return completed_;
 }
 
 // Quits the message loop when all callbacks are called or we've been waiting
 // too long for them (2 secs without a callback).
 void MessageLoopHelper::TimerExpired() {
   CHECK_LE(callbacks_called_, num_callbacks_);
   if (callbacks_called_ == num_callbacks_) {
@@ skipping 26 matching lines @@
 void CallbackTest::RunWithParams(const Tuple1<int>& params) {
   if (reuse_) {
     DCHECK_EQ(1, reuse_);
     if (2 == reuse_)
       helper_->set_callback_reused_error(true);
     reuse_++;
   }
 
   helper_->CallbackWasCalled();
 }