Revert 236324 "GYP: Update revision in DEPS, 1785 -> 1794"

The gcc -> cc change breaks (non-clang) goma. This doubles build time on
lots of bots (see e.g. cycle time graph on
http://build.chromium.org/p/chromium.chrome/stats/Google%20Chrome%20Linux%20x64
), so revert this roll for now. We need to teach goma to handle cc / c++ first.
(If you're in a hurry to roll gyp, revert the cc / c++ change in gyp land and
then roll forward.)

> GYP: Update revision in DEPS, 1785 -> 1794
> 
> r1794 Add BaseAddress (/BASE) support to gyp's msvs ninja generator.
> r1793 Edited wiki page GypTesting through web user interface.
> r1792 .close() build.ninja in ninja generator
> r1791 ninja: use cc and c++ instead of gcc and g++ by default on non-Windows.
> r1790 ninja: When the installed Xcode is Xcode 5 or later, use ['x86_64'] as the default value of ARCHS instead of ['i386'].
> r1789 xcode: Xcode 5 changes the "up_to_date_ending" again. This fix allows most (but not all) tests to pass with Xcode 5.
> r1788 win: Fix behaviour of MinimumRequiredVersion
> r1787 Use exec and proper quoting in top-level gyp command.
> r1786 Fix error message when using exclusion
> 
> BUG=NONE
> 
> Review URL: https://codereview.chromium.org/78823002

TBR=robertshield@chromium.org

Review URL: https://codereview.chromium.org/80123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236373 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236374 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236374