Revert of add peekPixels to SkCanvas and SkSurface

src/core/SkBitmapDevice.cpp

Index: src/core/SkBitmapDevice.cpp
diff --git a/src/core/SkBitmapDevice.cpp b/src/core/SkBitmapDevice.cpp
index 374bef98c127caacf6f6c139dda0666e5a4fcfeb..9dde6e172ec1077fabe5261dea1a5e5ceeefce43 100644
--- a/src/core/SkBitmapDevice.cpp
+++ b/src/core/SkBitmapDevice.cpp
@@ -52,10 +52,6 @@
 }
 
 SkBitmapDevice::~SkBitmapDevice() {
-}
-
-SkImageInfo SkBitmapDevice::imageInfo() const {
-    return fBitmap.info();
 }
 
 void SkBitmapDevice::replaceBitmapBackendForRasterSurface(const SkBitmap& bm) {
@@ -390,16 +386,6 @@
     return SkSurface::NewRaster(info);
 }
 
-const void* SkBitmapDevice::peekPixels(SkImageInfo* info, size_t* rowBytes) {
-    if (fBitmap.getPixels() && fBitmap.asImageInfo(info)) {
-        if (rowBytes) {
-            *rowBytes = fBitmap.rowBytes();
-        }
-        return fBitmap.getPixels();
-    }
-    return NULL;
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkBitmapDevice::filterTextFlags(const SkPaint& paint, TextFlags* flags) {