Prepare V8MessagePortCustom.cpp for upstreaming to WebKit
Prepare V8MessagePortCustom.cpp for upstreaming to WebKit

Original review http://codereview.chromium.org/113241.

BUG=http://crbug.com/11782
TEST=Run disabled message port layout tests (*message*-disabled) under
LayoutTests/fast/events. Note that these are disabled by default


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@15971 0039d316-1c4b-4281-b951-d872f2087c98

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