Update common_audio

Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1

Update notes:

 * Moved src/ to webrtc/ to easily diff against the third_party/webrtc
   in the chromium tree

 * ARM/NEON/MIPS support is not yet hooked up

 * Tests have not been copied

webrtc/base/constructormagic.h

@@ -0,0 +1,34 @@
+/*
+ *  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_CONSTRUCTORMAGIC_H_
+#define WEBRTC_BASE_CONSTRUCTORMAGIC_H_
+
+// Put this in the declarations for a class to be unassignable.
+#define RTC_DISALLOW_ASSIGN(TypeName) \
+  void operator=(const TypeName&) = delete
+
+// A macro to disallow the copy constructor and operator= functions. This should
+// be used in the declarations for a class.
+#define RTC_DISALLOW_COPY_AND_ASSIGN(TypeName) \
+  TypeName(const TypeName&) = delete;          \
+  RTC_DISALLOW_ASSIGN(TypeName)
+
+// A macro to disallow all the implicit constructors, namely the default
+// constructor, copy constructor and operator= functions.
+//
+// This should be used in the declarations for a class that wants to prevent
+// anyone from instantiating it. This is especially useful for classes
+// containing only static methods.
+#define RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
+  TypeName() = delete;                               \
+  RTC_DISALLOW_COPY_AND_ASSIGN(TypeName)
+
+#endif  // WEBRTC_BASE_CONSTRUCTORMAGIC_H_