Fix crash in BitmapImage::destroyDecodedData()
Fix crash in BitmapImage::destroyDecodedData()

In some cases, m_currentFrame may be bigger than m_frames.size().
Should limit the upper bound of the loop to m_frames.size().

BUG=241219
TEST=Manual test with http://www.guardian.co.uk/sport/blog/2013/may/04/gifs-boxers-coaches-david-luiz

Review URL: https://chromiumcodereview.appspot.com/15182003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150464 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs