GitLab

This change reduces ~800 lines from gdata_file_system.cc
Along the way move some functions to gdata_util.h, which
are needed for gdata_file_system.cc and gdata_wapi_feed_loader.cc

BUG=138268
TEST=none; just move code around. should not change the behaviors
TBR=ben@chromium.org
for chrome_browser.gypi

Review URL: https://chromiumcodereview.appspot.com/10834170

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150027 0039d316-1c4b-4281-b951-d872f2087c98