Remove gpu support for willUseHWAALines.

src/gpu/gl/GrGpuGL.h

Index: src/gpu/gl/GrGpuGL.h
diff --git a/src/gpu/gl/GrGpuGL.h b/src/gpu/gl/GrGpuGL.h
index a8a9727b32160faf984f5b8c1da155418a9434e8..e67197219d8c389b26c128342c6fb2f639777f86 100644
--- a/src/gpu/gl/GrGpuGL.h
+++ b/src/gpu/gl/GrGpuGL.h
@@ -443,15 +443,7 @@ private:
         }
     } fHWBlendState;
 
-    struct {
-        TriState fMSAAEnabled;
-        TriState fSmoothLineEnabled;
-        void invalidate() {
-            fMSAAEnabled = kUnknown_TriState;
-            fSmoothLineEnabled = kUnknown_TriState;
-        }
-    } fHWAAState;
-
+    TriState fMSAAEnabled;
 
     GrGLProgram::MatrixState    fHWProjectionMatrixState;