Remove remains of webrtc/base

webrtc/base/thread_annotations.h

Index: webrtc/base/thread_annotations.h
diff --git a/webrtc/base/thread_annotations.h b/webrtc/base/thread_annotations.h
deleted file mode 100644
index 5b94ffed85299b0ea9de407974be00a8ffae9c90..0000000000000000000000000000000000000000
--- a/webrtc/base/thread_annotations.h
+++ /dev/null
@@ -1,27 +0,0 @@
-//
-// Copyright (c) 2013 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.
-//
-// Borrowed from
-// https://code.google.com/p/gperftools/source/browse/src/base/thread_annotations.h
-// but adapted for clang attributes instead of the gcc.
-//
-// This header file contains the macro definitions for thread safety
-// annotations that allow the developers to document the locking policies
-// of their multi-threaded code. The annotations can also help program
-// analysis tools to identify potential thread safety issues.
-
-#ifndef WEBRTC_BASE_THREAD_ANNOTATIONS_H_
-#define WEBRTC_BASE_THREAD_ANNOTATIONS_H_
-
-
-// This header is deprecated and is just left here temporarily during
-// refactoring. See https://bugs.webrtc.org/7634 for more details.
-#include "webrtc/rtc_base/thread_annotations.h"
-
-#endif  // WEBRTC_BASE_THREAD_ANNOTATIONS_H_