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URLFetcher is going to have a new method 'SaveResponseToFile'.
FileWriter is going to manage both temporary and ordinary files.

BUG=chromium-os:26971
TEST=content_unittests --gtest_filter="URLFetcher*"


Review URL: http://codereview.chromium.org/9580003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124846 0039d316-1c4b-4281-b951-d872f2087c98