Switch to static_assert in base/.

base/macros.h

Index: base/macros.h
diff --git a/base/macros.h b/base/macros.h
index c5f503fbc3ae9158f82ecd3f487ac0e13bb7ae77..65c7749367fc91a39fd7fae9393e99677abbda95 100644
--- a/base/macros.h
+++ b/base/macros.h
@@ -129,7 +129,8 @@ template <typename T, size_t N> char (&ArraySizeHelper(T (&array)[N]))[N];
 
 template <class Dest, class Source>
 inline Dest bit_cast(const Source& source) {
-  COMPILE_ASSERT(sizeof(Dest) == sizeof(Source), VerifySizesAreEqual);
+  static_assert(sizeof(Dest) == sizeof(Source),
+                "bit_cast requires source and destination to be the same size");
 
   Dest dest;
   memcpy(&dest, &source, sizeof(dest));