SkColorTable locking serves no purpose anymore.

src/images/SkImageEncoder_argb.cpp

Index: src/images/SkImageEncoder_argb.cpp
diff --git a/src/images/SkImageEncoder_argb.cpp b/src/images/SkImageEncoder_argb.cpp
index 296491eef81864ce0c7f48ec0af7b99c1f25f7be..02d5490452d7c092d4e98e93c8e209a4fc1cba3f 100644
--- a/src/images/SkImageEncoder_argb.cpp
+++ b/src/images/SkImageEncoder_argb.cpp
@@ -98,8 +98,7 @@ bool SkARGBImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bitmap, int
         return false;
     }
 
-    SkAutoLockColors ctLocker;
-    const SkPMColor* colors = ctLocker.lockColors(bitmap);
+    const SkPMColor* colors = bitmap.getColorTable() ? bitmap.getColorTable()->readColors() : NULL;
 
     const int argbStride = bitmap.width() * 4;
     SkAutoTDeleteArray<uint8_t> ada(new uint8_t[argbStride]);