Revert of add peekPixels to SkCanvas and SkSurface

samplecode/SampleCircle.cpp

Index: samplecode/SampleCircle.cpp
diff --git a/samplecode/SampleCircle.cpp b/samplecode/SampleCircle.cpp
index 9cc927e47d3c153a766f0dc31da60b291bb9430c..b101a1f25739aa1296d18f5c2e9e65abc520e7b7 100644
--- a/samplecode/SampleCircle.cpp
+++ b/samplecode/SampleCircle.cpp
@@ -71,6 +71,12 @@
         }
     }
 
+    static void blowup(SkCanvas* canvas, const SkIRect& src, const SkRect& dst) {
+        SkBaseDevice* device = canvas->getDevice();
+        const SkBitmap& bm = device->accessBitmap(false);
+        canvas->drawBitmapRect(bm, &src, dst, NULL);
+    }
+
     static void make_poly(SkPath* path, int n) {
         if (n <= 0) {
             return;