VideoCaptureFormat::PixelFormatToString: Fix string for UYVY

Review URL: https://codereview.chromium.org/850923002

Cr-Commit-Position: refs/heads/master@{#311478}

media/video/capture/video_capture_types.cc

@@ -47,7 +47,7 @@ std::string VideoCaptureFormat::PixelFormatToString(VideoPixelFormat format) {
   case PIXEL_FORMAT_YUY2:
     return "YUY2";
   case PIXEL_FORMAT_UYVY:
-    return "UYUY";
+    return "UYVY";
   case PIXEL_FORMAT_RGB24:
     return "RGB24";
   case PIXEL_FORMAT_ARGB: