Update references to buildbot globals deprecated by r10856

R=borenet@google.com

Review URL: https://codereview.chromium.org/23011035

git-svn-id: http://skia.googlecode.com/svn/trunk@10860 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/submit_try b/tools/submit_try
index bad1c77..e09e304 100755
--- a/tools/submit_try
+++ b/tools/submit_try
@@ -36,8 +36,8 @@
 ALL_ALIASES = [ALL_BUILDERS, COMPILE_BUILDERS, CQ_BUILDERS, REGEX]
 
 # Contact information for the build master.
-SKIA_BUILD_MASTER_HOST = str(buildbot_globals.Get('master_host'))
-SKIA_BUILD_MASTER_PORT = str(buildbot_globals.Get('external_port'))
+SKIA_BUILD_MASTER_HOST = str(buildbot_globals.Get('public_master_host'))
+SKIA_BUILD_MASTER_PORT = str(buildbot_globals.Get('public_external_port'))
 
 # All try builders have this suffix.
 TRYBOT_SUFFIX = '-Trybot'