[App Shell] Port app_shell to windows aura.

Allow windows developsers to run app_shell.

BUG=None
TEST=Build app_shell on windows with use_aura=1, it launches normally.

Review URL: https://codereview.chromium.org/136093011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248870 0039d316-1c4b-4281-b951-d872f2087c98
Disable noisy printf in drive_integration_service.cc

This is printed in every browser test, and just adds noise. Switch it
to LOG_IF so it's only printed when needed.

R=kinaba@chromium.org
BUG=339891

Review URL: https://codereview.chromium.org/149533005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248871 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248871
Implement retry for Register call in GCMNetworkChannel

When Register fails with transient erro retry with exponential backoff.

BUG=335670

Review URL: https://codereview.chromium.org/144383008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248872 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248872
Fix a crash due to uninitialized preference member in ProfileIOData
when in icognito mode. 

This variable should always be initialized, not just in incognito mode.

BUG=339909

Review URL: https://codereview.chromium.org/148983006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248873 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248873