remove/deprecate SkBitmap::getTexture, as it now always returns false

include/core/SkBitmap.h

Index: include/core/SkBitmap.h
diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h
index 5406f9432887eaa1bda88ad5792511abfd97a09a..5ff67e4fbbb123f352b848f8e91699e91f895a22 100644
--- a/include/core/SkBitmap.h
+++ b/include/core/SkBitmap.h
@@ -23,7 +23,10 @@ class SkPixelRef;
 class SkPixelRefFactory;
 class SkRegion;
 class SkString;
+
+#ifdef SK_SUPPORT_LEGACY_BITMAP_GETTEXTURE
 class GrTexture;
+#endif
 
 /** \class SkBitmap
 
@@ -468,9 +471,9 @@ public:
                (this->colorType() != kIndex_8_SkColorType || fColorTable);
     }
 
-    /** Returns the pixelRef's texture, or NULL
-     */
-    GrTexture* getTexture() const;
+#ifdef SK_SUPPORT_LEGACY_BITMAP_GETTEXTURE
+    GrTexture* getTexture() const { return nullptr; }
+#endif
 
     /** Return the bitmap's colortable, if it uses one (i.e. colorType is
         Index_8) and the pixels are locked.