Fixing refcount leak in SkBitmapHeap caused by collisions in SkFlatDictionary

BUG=http://code.google.com/p/chromium/issues/detail?id=155875
TEST=DeferredCanvas unit test, subtest TestDeferredCanvasBitmapShaderNoLeak
Review URL: https://codereview.appspot.com/6713048

git-svn-id: http://skia.googlecode.com/svn/trunk@5982 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed