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

tools/picture_utils.cpp

Index: tools/picture_utils.cpp
diff --git a/tools/picture_utils.cpp b/tools/picture_utils.cpp
index a6803c67db42efdb26d5a4d8a50869860350a65c..453320122b7092f661c9697e72270258201adbb3 100644
--- a/tools/picture_utils.cpp
+++ b/tools/picture_utils.cpp
@@ -18,9 +18,8 @@
 
 namespace sk_tools {
     void force_all_opaque(const SkBitmap& bitmap) {
-        SkASSERT(nullptr == bitmap.getTexture());
         SkASSERT(kN32_SkColorType == bitmap.colorType());
-        if (bitmap.getTexture() || kN32_SkColorType == bitmap.colorType()) {
+        if (kN32_SkColorType == bitmap.colorType()) {
             return;
         }