Revert 218049 "Temporarily disable v8 proxy resolver on win8 metro mode"

The work around was only required for non-aura metro mode.

> BUG=266838
> R=eroman@chromium.org
>
> Review URL: https://chromiumcodereview.appspot.com/22893027

BUG=313732
R=eroman@chromium.org

Review URL: https://codereview.chromium.org/64403002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233886 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233886
Build mac and linux release builds with symbols and don't strip them by default

On Mac, we already build with symbols, but strip them.

Building with symbols (a) matches what we do for official builds and (b)
makes crashes on release builders more useful.

BUG=315598
R=erg@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/64753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233887 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233887