Fixed uninitialized use in ExtensionService, introduced in http://crrev.com/134251
Fixed uninitialized use in ExtensionService, introduced in http://crrev.com/134251

TBR=asargent@chromium.org
BUG=124163
TEST=Valgrind bots are happy

Review URL: https://chromiumcodereview.appspot.com/10254003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@134255 0039d316-1c4b-4281-b951-d872f2087c98

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