Disable using Swarming for linux.

projects.py

Index: projects.py
diff --git a/projects.py b/projects.py
index d406298a9cb867f96c9c6f7f20e2ecd0cb595348..f27eb734edc61af77686a6582b9546ca82f45ceb 100644
--- a/projects.py
+++ b/projects.py
@@ -400,11 +400,14 @@ def _gen_chromium(user, root_dir, rietveld_obj, no_try):
       'unit_tests',
     )
 
+    # pylint: disable=W0612
     swarm_test_map = dict(
       (test, test + '_swarm') for test in swarm_enabled_tests)
 
+    # Commenting out the items below will make the CQ not use swarm for its
+    # execution. Uncomment to make the CQ use Swarming again.
     swarm_enabled_builders_and_tests = {
-      'linux_rel': swarm_test_map,
+      #'linux_rel': swarm_test_map,
       # 'mac_rel': swarm_test_map,
       # 'win_rel': swarm_test_map,
     }
@@ -425,10 +428,10 @@ def _gen_chromium(user, root_dir, rietveld_obj, no_try):
     ]
 
     # Add the swarm enabled builders with swarm accepted tests.
-    for builder, swarm_enabled_tests in (
+    for builder, builder_swarm_enabled_tests in (
         swarm_enabled_builders_and_tests.iteritems()):
       regular_tests = list(set(builders_and_tests[builder]) -
-                           set(swarm_enabled_tests))
+                           set(builder_swarm_enabled_tests))
 
       step_verifiers.append(
           try_job_steps.TryJobTriggeredOrNormalSteps(
@@ -436,7 +439,7 @@ def _gen_chromium(user, root_dir, rietveld_obj, no_try):
               trigger_name=builder,
               prereq_builder=prereq_builder,
               prereq_tests=prereq_tests,
-              steps=swarm_enabled_tests,
+              steps=builder_swarm_enabled_tests,
               trigger_bot_steps=regular_tests,
               use_triggered_bot=False))