Be explicit about the vector<FrameInfo> type

This fixes a compile error in Chromium.

BUG=skia:6026

Change-Id: Idd5ad22cb52a084836de6e1427f1f047d1feab08
Reviewed-on: https://skia-review.googlesource.com/5500
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>

include/codec/SkCodec.h

@@ -778,7 +778,7 @@ protected:
 
     virtual std::vector<FrameInfo> onGetFrameInfo() {
         // empty vector - this is not animated.
-        return {};
+        return std::vector<FrameInfo>{};
     }
 
     virtual int onGetRepetitionCount() {