Remove CSSCanvas values.

sky/engine/core/html/canvas/WebGLRenderingContext.cpp

Index: sky/engine/core/html/canvas/WebGLRenderingContext.cpp
diff --git a/sky/engine/core/html/canvas/WebGLRenderingContext.cpp b/sky/engine/core/html/canvas/WebGLRenderingContext.cpp
index f64235f5e4940c5d5ff7e1dec92ee4123b3ed394..191a9a93ec7a2bec8b96cbf2cdfc3d36d6e0f0f9 100644
--- a/sky/engine/core/html/canvas/WebGLRenderingContext.cpp
+++ b/sky/engine/core/html/canvas/WebGLRenderingContext.cpp
@@ -70,7 +70,7 @@ PassOwnPtr<WebGLRenderingContext> WebGLRenderingContext::create(HTMLCanvasElemen
     }
     Settings* settings = frame->settings();
 
-    // The only situation that attrs is null is through Document::getCSSCanvasContext().
+    // TODO(esprehn): This should never be null.
     RefPtr<WebGLContextAttributes> defaultAttrs = nullptr;
     if (!attrs) {
         defaultAttrs = WebGLContextAttributes::create();