Undo the recent stress changes to the context loss test.

The underlying infrastructure isn't ready for this to crash the GPU
process 30 times in a row. Change back to running this test once to
address continued flakiness on the bots.

BUG=365904
NOTRY=true
TBR=bajones@chromium.org

Review URL: https://codereview.chromium.org/252793003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266315 0039d316-1c4b-4281-b951-d872f2087c98

content/test/gpu/gpu_tests/context_lost.py

@@ -113,7 +113,7 @@ class ContextLost(test_module.Test):
               'javascript': 'window.domAutomationController._loaded' }
           ],
           'kill_gpu_process': True,
-          'number_of_gpu_process_kills': 30,
+          'number_of_gpu_process_kills': 1,
         },
         {
           'name': 'ContextLost.WebGLContextLostFromLoseContextExtension',