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: svn://svn.chromium.org/blink/trunk@151347 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed