Use C++11 alignment primitives

base/compiler_specific.h

Index: base/compiler_specific.h
diff --git a/base/compiler_specific.h b/base/compiler_specific.h
index 34b0c2d7a2913f98c9b7faa10cc5ab7d7640b4c0..48b0139c659e4aa4aa78015dedac72a48bc972ff 100644
--- a/base/compiler_specific.h
+++ b/base/compiler_specific.h
@@ -107,25 +107,6 @@
 #define ALWAYS_INLINE inline
 #endif
 
-// Specify memory alignment for structs, classes, etc.
-// Use like:
-//   class ALIGNAS(16) MyClass { ... }
-//   ALIGNAS(16) int array[4];
-#if defined(COMPILER_MSVC)
-#define ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
-#elif defined(COMPILER_GCC)
-#define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
-#endif
-
-// Return the byte alignment of the given type (available at compile time).
-// Use like:
-//   ALIGNOF(int32_t)  // this would be 4
-#if defined(COMPILER_MSVC)
-#define ALIGNOF(type) __alignof(type)
-#elif defined(COMPILER_GCC)
-#define ALIGNOF(type) __alignof__(type)
-#endif
-
 // Annotate a function indicating the caller must examine the return value.
 // Use like:
 //   int foo() WARN_UNUSED_RESULT;