replace COMPILE_ASSERT with static_assert in net/

net/base/mime_sniffer.cc

Index: net/base/mime_sniffer.cc
diff --git a/net/base/mime_sniffer.cc b/net/base/mime_sniffer.cc
index 61ef948211059db1857f10df3cf5b9386a7eaaf3..ad4212dc2811af7567661052f2cef560fefe8c74 100644
--- a/net/base/mime_sniffer.cc
+++ b/net/base/mime_sniffer.cc
@@ -122,7 +122,8 @@ struct MagicNumber {
 
 template <int MagicSize, int MaskSize>
 class VerifySizes {
-  COMPILE_ASSERT(MagicSize == MaskSize, sizes_must_be_equal);
+  static_assert(MagicSize == MaskSize, "sizes must be equal");
+
  public:
   enum { SIZES = MagicSize };
 };