Revert 6107 "Adds a modified copy of talk/base to webrtc/base. I..."

This breaks Chromium FYI builds and prevent roll of webrtc/libjingle to Chrome.

http://chromegw.corp.google.com/i/chromium.webrtc.fyi/builders/Win%20Builder/builds/457


> Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.
> 
> BUG=N/A
> R=andrew@webrtc.org, wu@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/12199004

TBR=henrike@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/14479004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6116 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/ratetracker.h

@@ -1,42 +0,0 @@
-/*
- *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_BASE_RATETRACKER_H_
-#define WEBRTC_BASE_RATETRACKER_H_
-
-#include <stdlib.h>
-#include "webrtc/base/basictypes.h"
-
-namespace rtc {
-
-// Computes instantaneous units per second.
-class RateTracker {
- public:
-  RateTracker();
-  virtual ~RateTracker() {}
-
-  size_t total_units() const;
-  size_t units_second();
-  void Update(size_t units);
-
- protected:
-  // overrideable for tests
-  virtual uint32 Time() const;
-
- private:
-  size_t total_units_;
-  size_t units_second_;
-  uint32 last_units_second_time_;
-  size_t last_units_second_calc_;
-};
-
-}  // namespace rtc
-
-#endif  // WEBRTC_BASE_RATETRACKER_H_