Update V8 to r7427: Fix missing include in global-handles.h

Partial cherry-pick of
http://code.google.com/p/v8/source/detail?r=7579

We can't cherry-pick the entire change because it touches code we
don't yet have.

Change-Id: Ia606ab7049ffa66da61d965c6fa23a9b42a22fca
1 file changed