Delete ARRAYSIZE_UNSAFE (from base/macros.h).

base/macros.h

Index: base/macros.h
diff --git a/base/macros.h b/base/macros.h
index f89d7d11f9737ed6ce890783323daf227e277b6b..b6240da2beee0f63781e31beaf396f390b3e939b 100644
--- a/base/macros.h
+++ b/base/macros.h
@@ -67,15 +67,6 @@ char (&ArraySizeHelper(const T (&array)[N]))[N];
 
 #define arraysize(array) (sizeof(ArraySizeHelper(array)))
 
-// DEPRECATED: Just use |arraysize()|, now that C++11 has removed the
-// limitations that forced the use of |ARRAYSIZE_UNSAFE()|.
-// TODO(viettrungluu): Convert all instances and delete. (The only uses are now
-// in Blink; the ifdef is to prevent it from reappearing in Chromium.)
-// crbug.com/423134
-#if defined(BLINK_PLATFORM) || defined(BLINK_PLATFORM_IMPLEMENTATION)
-#define ARRAYSIZE_UNSAFE(a) arraysize(a)
-#endif
-
 
 // Use implicit_cast as a safe version of static_cast or const_cast
 // for upcasting in the type hierarchy (i.e. casting a pointer to Foo