Update webgl conformance test expectations

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 de6918e2359452f9ae086ed998360ffe7e6447ba..18f6bd4e3de67a347cc35319cf1d24f3b838d097 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
@@ -27,10 +27,6 @@ class WebGLConformanceExpectations(test_expectations.TestExpectations):
     # Fails on all platforms
     self.Fail('conformance/glsl/misc/shaders-with-mis-matching-uniforms.html',
         bug=351396)
-    self.Fail('conformance/glsl/misc/boolean_precision.html',
-        bug=368874)
-    self.Fail('conformance/glsl/misc/shader-struct-scope.html',
-        bug=368910)
 
     # Flaky on Win
     self.Fail('conformance/extensions/webgl-draw-buffers.html',
@@ -50,6 +46,10 @@ class WebGLConformanceExpectations(test_expectations.TestExpectations):
     self.Fail('conformance/glsl/misc/shader-with-array-of-structs-uniform.html',
         ['win7', 'intel', 'nvidia'], bug=373972)
 
+    # Mac failures
+    self.Fail('conformance/glsl/misc/shader-struct-scope.html',
+        ['mac'], bug=368910)
+
     # Mac / Intel failures
     # Radar 13499466
     self.Fail('conformance/limits/gl-max-texture-dimensions.html',