_pyautolib.so is linked with libasan.a if ASAN is used.

BUG=chromium-os:20711
TEST=run autotests under ASAN

Review URL: http://codereview.chromium.org/8065007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@103298 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/build/common.gypi b/build/common.gypi
index ef9b233e..26868ae 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1759,7 +1759,8 @@
             # Only in the linux section for now, since ASAN doesn't
             # work on Mac yet.
             'cflags': [
-              '-fasan -w',
+              '-fasan',
+              '-w',
             ],
             'ldflags': [
               '-fasan',