Hide GrDrawTarget::Caps's member vars

Review URL: https://codereview.appspot.com/6499044



git-svn-id: http://skia.googlecode.com/svn/trunk@5328 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index 94b607c..819092d 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -573,7 +573,7 @@
 
     static const uint32_t gReqDerivMask = SkPath::kCubic_SegmentMask |
                                           SkPath::kQuad_SegmentMask;
-    if (!target->getCaps().fShaderDerivativeSupport &&
+    if (!target->getCaps().shaderDerivativeSupport() &&
         (gReqDerivMask & path.getSegmentMasks())) {
         return false;
     }