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The number of calles of GetGDataEntryByPath() is reduced from 19 to 18.
StartFileUploadParams is introduced to overcome the limitation of Bind.

BUG=137694
TEST=out/Release/unit_tests --gtest_filter=GData*; confirm uploading to drive works as before by "save image as" to Drive.

Review URL: https://chromiumcodereview.appspot.com/10809054

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@147964 0039d316-1c4b-4281-b951-d872f2087c98