Some GrGLShaderBuilder cleanup

Review URL: https://codereview.appspot.com/6500043/



git-svn-id: http://skia.googlecode.com/svn/trunk@5322 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index 357d1db..78d2f24 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -552,7 +552,7 @@
                                 const char* inputColor,
                                 const char* samplerName) {
     SkString t;
-    t.printf("%s.x", builder->fSampleCoords.c_str());
+    t.printf("%s.x", builder->defaultTexCoordsName());
     this->emitColorLookup(builder, t.c_str(), outputColor, samplerName);
 }