Revert of Revert "Revert of https://codereview.chromium.org/129423002/"

src/core/SkBitmap.cpp

Index: src/core/SkBitmap.cpp
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index 6615b1c52b3b46bfa0b2a969f5b15471d77bbb1f..f950e28cdccb2ca6b3a8a57ee9dc387621172f16 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -331,30 +331,6 @@
     }
     fAlphaType = SkToU8(alphaType);
     return true;
-}
-
-SkPixelRef* SkBitmap::installPixelRef(SkPixelRef* pr, const SkIRect* subset) {
-    if (NULL == pr) {
-        this->reset();
-        return NULL;
-    }
-
-    const SkImageInfo& info = pr->info();
-
-    fConfig = SkColorTypeToBitmapConfig(info.fColorType);
-    fAlphaType = info.fAlphaType;
-    fBytesPerPixel = info.bytesPerPixel();
-    // not known until we're locked
-    fRowBytes = 0;
-    
-    SkIRect bounds = { 0, 0, info.fWidth, info.fHeight };
-    if (subset && !bounds.intersect(*subset)) {
-        bounds.setEmpty();
-    }
-
-    fWidth = bounds.width();
-    fHeight = bounds.height();
-    return this->setPixelRef(pr, bounds.left(), bounds.top());
 }
 
 void SkBitmap::updatePixelsFromRef() const {