Upgrade to clang 278861

common.gypi

@@ -241,6 +241,7 @@
             'xcode_settings': {
               'WARNING_CFLAGS': [
                 '-Wno-unused-private-field',
+                '-Wno-address-of-packed-member',
               ],
             },
           }],  # OS=="mac"

script/update-clang.sh

@@ -8,7 +8,7 @@
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION=274142
+CLANG_REVISION=278861
 
 # This is incremented when pushing a new build of Clang at the same revision.
 CLANG_SUB_REVISION=1