remove (dumb) canvas::NewRaster, and rename surface::NewRasterPMColor to N32Premul

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index ff60c57fa7ec325a7678fbb8e1e28629b83e71a2..46dc3774f0b2f6c6e1d987de8493f700bf351955 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -62,35 +62,6 @@ public:
     SK_DECLARE_INST_COUNT(SkCanvas)
 
     /**
-     *  Attempt to allocate an offscreen raster canvas, matching the ImageInfo.
-     *  On success, return a new canvas that will draw into that offscreen.
-     *
-     *  The caller can access the pixels after drawing into this canvas by
-     *  calling readPixels() or peekPixels().
-     *
-     *  If the requested ImageInfo is opaque (either the colortype is
-     *  intrinsically opaque like RGB_565, or the info's alphatype is kOpaque)
-     *  then the pixel memory may be uninitialized. Otherwise, the pixel memory
-     *  will be initialized to 0, which is interpreted as transparent.
-     *
-     *  On failure, return NULL. This can fail for several reasons:
-     *  1. the memory allocation failed (e.g. request is too large)
-     *  2. invalid ImageInfo (e.g. negative dimensions)
-     *  3. unsupported ImageInfo for a canvas
-     *      - kUnknown_SkColorType, kIndex_8_SkColorType
-     *      - kIgnore_SkAlphaType
-     *      - this list is not complete, so others may also be unsupported
-     *
-     *  Note: it is valid to request a supported ImageInfo, but with zero
-     *  dimensions.
-     */
-    static SkCanvas* NewRaster(const SkImageInfo&);
-
-    static SkCanvas* NewRasterN32(int width, int height) {
-        return NewRaster(SkImageInfo::MakeN32Premul(width, height));
-    }
-
-    /**
      *  Attempt to allocate raster canvas, matching the ImageInfo, that will draw directly into the
      *  specified pixels. To access the pixels after drawing to them, the caller should call
      *  flush() or call peekPixels(...).