Add *.go to git-gs

That's the language all the kool kids are using.

TBR=xusydoc@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/10874003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@152711 0039d316-1c4b-4281-b951-d872f2087c98

git-gs

@@ -3,6 +3,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 git grep -n -e "$@" -- "*.h" "*.hpp" "*.cpp" "*.c" "*.cc" "*.cpp" "*.inl"\
-   "*.grd" "*.idl" "*.m" "*.mm" "*.py" "*.sh" "*.cfg" "*.tac"\
+   "*.grd" "*.idl" "*.m" "*.mm" "*.py" "*.sh" "*.cfg" "*.tac" "*.go"\
    "*SConscript" "SConscript*" "*.scons" "*.vcproj" "*.vsprops" "*.make"\
    "*.gyp" "*.gypi" "*.js" "*.html" "*.css" "*.ebuild"