Don't return unfound VS version, raise instead

This fallback behaviour may have worked at some point, but doesn't
any more, so simply error out with a clear message rather than trying
to continue.

R=timurrrr@chromium.org
BUG=https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/O_OGfq2nhSw

Review URL: https://codereview.chromium.org/595543003

git-svn-id: http://gyp.googlecode.com/svn/trunk@1978 78cadc50-ecff-11dd-a971-7dbc132099af
Don't run windows tests on other platforms

Build fix

TBR=timurrrr@chromium.org

Review URL: https://codereview.chromium.org/598643003

git-svn-id: http://gyp.googlecode.com/svn/trunk@1979 78cadc50-ecff-11dd-a971-7dbc132099af
Adds swift file support to xcode generation.

BUG=
Patch from Josh Converse <jconverse@google.com>!

R=justincohen@chromium.org, thomasvl@chromium.org

Review URL: https://codereview.chromium.org/560683003

git-svn-id: http://gyp.googlecode.com/svn/trunk@1980 78cadc50-ecff-11dd-a971-7dbc132099af
I need this change to create Windows 8.1/Windows Phone 8.1 projects that compile modules that can be consumed by Windows Store Applications (WinRT).

This change is required as a prerequisite to adding proper Windows Store (8.1 only) support to Google's ANGLE codebase.

Patch from coopp@microsoft.com.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/521693002

git-svn-id: http://gyp.googlecode.com/svn/trunk@1981 78cadc50-ecff-11dd-a971-7dbc132099af
Revert r1978 and r1979

BUG=

Review URL: https://codereview.chromium.org/594923002

git-svn-id: http://gyp.googlecode.com/svn/trunk@1982 78cadc50-ecff-11dd-a971-7dbc132099af