Fix blits from multisampled renderbuffers to alpha:false WebGL back buffer.

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
index 51dde2060d6e07270b43d9bf1d207f4a948d2eac..ac7e78f954877ee2ff1890778850232e6cf58121 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -223,9 +223,6 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/glsl3/vector-dynamic-indexing-swizzled-lvalue.html',
         ['mac'], bug=709351)
     self.Fail('conformance2/rendering/' +
-        'blitframebuffer-resolve-to-back-buffer.html',
-        ['mac'], bug=699566)
-    self.Fail('conformance2/rendering/' +
         'framebuffer-completeness-unaffected.html',
         ['mac'], bug=630800)
     self.Fail('deqp/functional/gles3/fbocompleteness.html',