WebGL: Mark half float test fail on Win new AMD.

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
index d73a12411c1944ec3a676296ebee11543ccb6d7f..132ca31d39b5b290e927b49aeaaaa6cc160654b1 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
@@ -151,7 +151,8 @@ class WebGLConformanceExpectations(GpuTestExpectations):
     # Win AMD failures
     # This test is probably flaky on all AMD, but only visible on the
     # new AMD (the whole test suite is flaky on the old config).
-    self.Flaky('conformance/extensions/oes-texture-half-float.html',
+    # Mark as Fail since it often flakes in all 3 retries
+    self.Fail('conformance/extensions/oes-texture-half-float.html',
               ['win', ('amd', 0x6613)], bug=653533)
 
     # Win / AMD D3D9 failures