Fix test_isolation_mode to default to noop on android.

Android is not supported in isolated testing yet.

NOTRY=true
TBR=csharp@chromium.org
BUG=

Review URL: https://codereview.chromium.org/13514008

git-svn-id: http://src.chromium.org/svn/trunk/src/build@192416 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -616,7 +616,7 @@
         # target always calls tools/swarm_client/isolate.py. See the script's
         # --help for more information and the valid --mode values. Meant to be
         # overriden with GYP_DEFINES.
-        ['inside_chromium_build==1 and OS != "ios"', {
+        ['inside_chromium_build==1 and OS != "ios" and OS != "android"', {
           'test_isolation_mode%': 'check',
         }, {
           'test_isolation_mode%': 'noop',