Initialize hit count in PresentationAttributeCacheCleaner
Initialize hit count in PresentationAttributeCacheCleaner

The initial value (which was previously arbitrary) controls if presentationAttributeCache().clear() will be called the first time cleanCache() is called.

BUG=0

Review URL: https://chromiumcodereview.appspot.com/15998002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@151347 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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