Fixed bug in test frame generator, causing incorrect reuse of frame
object, in turn causing performance regression.

Plus a small optimization.

BUG=chromium:460954, 4329
R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/42499004

Cr-Commit-Position: refs/heads/master@{#8552}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8552 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/test/frame_generator.h b/webrtc/test/frame_generator.h
index 4598de8..969a358 100644
--- a/webrtc/test/frame_generator.h
+++ b/webrtc/test/frame_generator.h
@@ -33,7 +33,7 @@
 
   // Creates a frame generator that repeatedly plays a set of yuv files.
   // The frame_repeat_count determines how many times each frame is shown,
-  // with 0 = show the first frame indefinitely, 1 = show each frame once, etc.
+  // with 1 = show each frame once, etc.
   static FrameGenerator* CreateFromYuvFile(std::vector<std::string> files,
                                            size_t width,
                                            size_t height,