Remove unused matrix param from GrContext/GrDrawTarget rect drawing functions.

src/gpu/GrDrawTarget.h

Index: src/gpu/GrDrawTarget.h
diff --git a/src/gpu/GrDrawTarget.h b/src/gpu/GrDrawTarget.h
index 0c03e34041c1d2f654e4b6a2b37c9e35fbb48b8a..3d1a6431fb8359c5ece1440d10c11e04e7f7468a 100644
--- a/src/gpu/GrDrawTarget.h
+++ b/src/gpu/GrDrawTarget.h
@@ -398,22 +398,21 @@ public:
      *                    srcMatrix can be NULL when no srcMatrix is desired.
      */
     void drawRect(const SkRect& rect,
-                  const SkMatrix* matrix,
                   const SkRect* localRect,
                   const SkMatrix* localMatrix) {
         AutoGeometryPush agp(this);
-        this->onDrawRect(rect, matrix, localRect, localMatrix);
+        this->onDrawRect(rect, localRect, localMatrix);
     }
 
     /**
      * Helper for drawRect when the caller doesn't need separate local rects or matrices.
      */
-    void drawSimpleRect(const SkRect& rect, const SkMatrix* matrix = NULL) {
-        this->drawRect(rect, matrix, NULL, NULL);
+    void drawSimpleRect(const SkRect& rect) {
+        this->drawRect(rect, NULL, NULL);
     }
-    void drawSimpleRect(const SkIRect& irect, const SkMatrix* matrix = NULL) {
+    void drawSimpleRect(const SkIRect& irect) {
         SkRect rect = SkRect::Make(irect);
-        this->drawRect(rect, matrix, NULL, NULL);
+        this->drawRect(rect, NULL, NULL);
     }
 
     /**
@@ -929,7 +928,6 @@ private:
     // drawIndexedInstances, ...). The base class draws a two triangle fan using
     // drawNonIndexed from reserved vertex space.
     virtual void onDrawRect(const SkRect& rect,
-                            const SkMatrix* matrix,
                             const SkRect* localRect,
                             const SkMatrix* localMatrix);