remove unused field from SkDrawIter

src/core/SkCanvas.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkCanvasPriv.h"
@@ skipping 302 matching lines @@
         fMatrix.reset();
         fRasterClip.setRect(bounds);
         fLayer->reset(bounds);
     }
 };
 
 class SkDrawIter : public SkDraw {
 public:
     SkDrawIter(SkCanvas* canvas) {
         canvas = canvas->canvasForDrawIter();
-        fCanvas = canvas;
         canvas->updateDeviceCMCache();
 
         fClipStack = canvas->fClipStack;
         fCurrLayer = canvas->fMCRec->fTopLayer;
     }
 
     bool next() {
         // skip over recs with empty clips
         while (fCurrLayer && fCurrLayer->fClip.isEmpty()) {
             fCurrLayer = fCurrLayer->fNext;
@@ skipping 20 matching lines @@
     }
 
     SkBaseDevice* getDevice() const { return fDevice; }
     const SkRasterClip& getClip() const { return *fRC; }
     int getX() const { return fDevice->getOrigin().x(); }
     int getY() const { return fDevice->getOrigin().y(); }
     const SkMatrix& getMatrix() const { return *fMatrix; }
     const SkPaint* getPaint() const { return fPaint; }
 
 private:
-    SkCanvas*       fCanvas;
     const DeviceCM* fCurrLayer;
     const SkPaint*  fPaint;     // May be null.
 
     typedef SkDraw INHERITED;
 };
 
 /////////////////////////////////////////////////////////////////////////////
 
 static SkPaint* set_if_needed(SkLazyPaint* lazy, const SkPaint& orig) {
     return lazy->isValid() ? lazy->get() : lazy->set(orig);
@@ skipping 3019 matching lines @@
 
 SkAutoCanvasMatrixPaint::~SkAutoCanvasMatrixPaint() {
     fCanvas->restoreToCount(fSaveCount);
 }
 
 #ifdef SK_SUPPORT_LEGACY_NEW_SURFACE_API
 SkSurface* SkCanvas::newSurface(const SkImageInfo& info, const SkSurfaceProps* props) {
     return this->makeSurface(info, props).release();
 }
 #endif