Try removing texture-upload-size.html failure suppression.

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 4d99f3efe1ef9923c5ac8145357fcdbcf0e8b247..dc5ce0d35b1e789e296ab0199c9abf7b54d10e54 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
@@ -478,9 +478,3 @@ class WebGLConformanceExpectations(GpuTestExpectations):
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Skip('conformance/uniforms/uniform-default-values.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
-
-    # Flaky on Mac & Linux
-    self.Fail('conformance/textures/misc/texture-upload-size.html',
-        ['mac'], bug=436493)
-    self.Fail('conformance/textures/misc/texture-upload-size.html',
-        ['linux'], bug=436493)