Update master lkgr to use chromium_builder_asan target.

masters/master.chromium.lkgr/master_lkgr_cfg.py

Index: masters/master.chromium.lkgr/master_lkgr_cfg.py
diff --git a/masters/master.chromium.lkgr/master_lkgr_cfg.py b/masters/master.chromium.lkgr/master_lkgr_cfg.py
index 78671d81b3d4ba3c913fed791ded3d4060116dfa..9a5d003af03d58b4ac3ffbc6a9166c81bd5b8b3d 100644
--- a/masters/master.chromium.lkgr/master_lkgr_cfg.py
+++ b/masters/master.chromium.lkgr/master_lkgr_cfg.py
@@ -77,8 +77,7 @@ F('mac_full', mac().ChromiumFactory(
 B('Mac ASAN Release', 'mac_asan_rel', 'compile', 'chromium_lkgr')
 F('mac_asan_rel', linux().ChromiumASANFactory(
     clobber=True,
-    options=['--compiler=goma-clang', '--', '-target',
-             'chromium_builder_asan_mac'],
+    options=['--compiler=goma-clang', '--', '-target', 'chromium_builder_asan'],
     factory_properties={
        'cf_archive_build': ActiveMaster.is_production_host,
        'cf_archive_name': 'asan',
@@ -90,8 +89,7 @@ B('Mac ASAN Debug', 'mac_asan_dbg', 'compile', 'chromium_lkgr')
 F('mac_asan_dbg', linux().ChromiumASANFactory(
     clobber=True,
     target='Debug',
-    options=['--compiler=goma-clang', '--', '-target',
-             'chromium_builder_asan_mac'],
+    options=['--compiler=goma-clang', '--', '-target', 'chromium_builder_asan'],
     factory_properties={
        'cf_archive_build': ActiveMaster.is_production_host,
        'cf_archive_name': 'asan',