Fix linux_clang default try builder to only compile and not run tests.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 87f089419eb057c1c858a64a54833db12eb5801a..53b505805cfd1195484ca738e8cf42e018db2f56 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -329,9 +329,8 @@ def GetPreferredTrySlaves(project, change):
   if only_objc_files:
     return ['mac_rel']
   preferred = ['win_rel', 'linux_rel', 'mac_rel']

[tfarina, 2012/05/01 01:32:19]

it would be interesting to have a win_re = '...' for files that end in _win.cc
as well, so we don't trigger linux_rel and mac_rel unnecessarily.

[M-A Ruel, 2012/05/01 01:35:41]

I'm fine with this idea but this is outside the scope of this CL.

-  preferred = ['win_rel', 'linux_rel', 'mac_rel', 'linux_clang']
   if any(f.endswith(('.h', '.cc', '.cpp', '.cxx')) for f in affected_files):
-    preferred.append('linux_clang')
+    preferred.append('linux_clang:compile')
   aura_re = '_aura[^/]*[.][^/]*'
   if any(re.search(aura_re, f) for f in affected_files):
     preferred.append('linux_chromeos')