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This change essentially moves internally buffered network data from WebURLLoader to BufferedResourceLoader as soon as there's capacity instead of waiting for an arbitrary threshold.

There's no fear of spamming progress events at a higher frequency since progress events are limited to firing at a minimum interval of 350ms.

BUG=124719
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10694098

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146133 0039d316-1c4b-4281-b951-d872f2087c98