Change trace test expectations back to skipping.

content/test/gpu/gpu_tests/trace_test_expectations.py

Index: content/test/gpu/gpu_tests/trace_test_expectations.py
diff --git a/content/test/gpu/gpu_tests/trace_test_expectations.py b/content/test/gpu/gpu_tests/trace_test_expectations.py
index 45b772fdbe7a5efb5c40df6ebab938342caf73c5..a1f9d01b83d2744b2b90b83b4ae0040a5bc0736a 100644
--- a/content/test/gpu/gpu_tests/trace_test_expectations.py
+++ b/content/test/gpu/gpu_tests/trace_test_expectations.py
@@ -11,12 +11,7 @@ class TraceTestExpectations(GpuTestExpectations):
     # Sample Usage:
     # self.Fail('TraceTest.Canvas2DRedBox',
     #     ['mac', 'amd', ('nvidia', 0x1234)], bug=123)
-
-    self.Flaky('trace_test.Canvas2DRedBox', bug=512622, max_num_retries=5)
-    self.Flaky('trace_test.CSS3DBlueBox', bug=512622, max_num_retries=5)
-
-    # Test has become increasingly flaky around 7/31/15: crbug.com/517232
-    self.Flaky('trace_test.WebGLGreenTriangle', bug=517232, max_num_retries=5)
+    self.Skip('*', bug=512622)
 
 class DeviceTraceTestExpectations(GpuTestExpectations):
   def SetExpectations(self):