Suppress the Valgrind memory leak from the 58138 webkit roll.
Suppress the Valgrind memory leak from the 58138 webkit roll.

BUG=42590
TEST=Valgrind ui_tests goes green.
TBR=wtc
Review URL: http://codereview.chromium.org/1699014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@45655 0039d316-1c4b-4281-b951-d872f2087c98

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