Change the test_isolation_outdir default from PRODUCT_DIR to PRODUCT_DIR/isolate

Otherwise a lot of spew is generated when using test_isolation_mode=hashtable.
Do not use hashtable since outdir is also used with _run and _remap.

R=mad@chromium.org
BUG=98636
TEST=

Review URL: https://chromiumcodereview.appspot.com/10382238

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137914 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed