BodyStreamBuffer shouldn't run scripts when ActiveDOMObjects are stopped

Some DataConsumerHandle subclasses close the handle when ActiveDOMObjects are
stopped. BodyStreamBuffer::didGetReadable should not do anything because
executing scripts are forbidden in such cases. As BodyStreamBuffer::stop will
be called shortly, just returning early is enough.

BUG=625563
R=hiroshige

Review-Url: https://codereview.chromium.org/2146453002
Cr-Commit-Position: refs/heads/master@{#406542}
1 file changed