Retract GrRenderTarget a bit

These sites don't necessarily need the full power of a GrRenderTarget object. This is a clean up for switching over to GrRenderTargetProxys.

Review URL: https://codereview.chromium.org/1486923004
diff --git a/src/gpu/batches/GrTessellatingPathRenderer.cpp b/src/gpu/batches/GrTessellatingPathRenderer.cpp
index 082a8db..27e287e 100644
--- a/src/gpu/batches/GrTessellatingPathRenderer.cpp
+++ b/src/gpu/batches/GrTessellatingPathRenderer.cpp
@@ -1634,7 +1634,7 @@
     }
 
     SkIRect clipBoundsI;
-    args.fPipelineBuilder->clip().getConservativeBounds(rt, &clipBoundsI);
+    args.fPipelineBuilder->clip().getConservativeBounds(rt->width(), rt->height(), &clipBoundsI);
     SkRect clipBounds = SkRect::Make(clipBoundsI);
     SkMatrix vmi;
     if (!args.fViewMatrix->invert(&vmi)) {