Remove arraysize.h gcc hack and Chromium override.

webrtc/base/arraysize.h

Index: webrtc/base/arraysize.h
diff --git a/webrtc/base/arraysize.h b/webrtc/base/arraysize.h
index 0bb0a62ed842c8b178867ab8e132e4b049cb6db2..56a10392afd8f864c30defbe10a8d5cb01724eda 100644
--- a/webrtc/base/arraysize.h
+++ b/webrtc/base/arraysize.h
@@ -24,16 +24,7 @@
 // This template function declaration is used in defining arraysize.
 // Note that the function doesn't need an implementation, as we only
 // use its type.
-template <typename T, size_t N>
-char (&ArraySizeHelper(T (&array)[N]))[N];
-
-// That gcc wants both of these prototypes seems mysterious. VC, for
-// its part, can't decide which to use (another mystery). Matching of
-// template overloads: the final frontier.
-#ifndef _MSC_VER
-template <typename T, size_t N>
-char (&ArraySizeHelper(const T (&array)[N]))[N];
-#endif
+template <typename T, size_t N> char (&ArraySizeHelper(T (&array)[N]))[N];
 
 #define arraysize(array) (sizeof(ArraySizeHelper(array)))