AVFoundation: Check selector when testing if max frame rate setting is supported.

media/video/capture/mac/video_capture_device_avfoundation_mac.mm

Index: media/video/capture/mac/video_capture_device_avfoundation_mac.mm
diff --git a/media/video/capture/mac/video_capture_device_avfoundation_mac.mm b/media/video/capture/mac/video_capture_device_avfoundation_mac.mm
index f780958b858da381a8f9ea2ef403648d0e401852..6261c8565c953599513f1ab38d59ed15c01c30d4 100644
--- a/media/video/capture/mac/video_capture_device_avfoundation_mac.mm
+++ b/media/video/capture/mac/video_capture_device_avfoundation_mac.mm
@@ -8,6 +8,7 @@
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
+#include "base/mac/scoped_nsexception_enabler.h"
 #include "media/video/capture/mac/video_capture_device_mac.h"
 #include "ui/gfx/size.h"
 
@@ -168,6 +169,9 @@
     [captureConnection setVideoMinFrameDuration:
         CoreMediaGlue::CMTimeMake(1, frameRate)];
   }
+  // TODO(mcasas): Allow exceptions in the following call, related to bugs
+  // http://crbug.com/327532 and http://crbug.com/328096.
+  base::mac::ScopedNSExceptionEnabler enabler;
   if ([captureConnection isVideoMaxFrameDurationSupported]) {

[Robert Sesek, 2013/12/16 15:41:35]

Instead, if ([captureConnection
respondsToSelector:@selector(isVideoMaxFrameDurationSupported] &&
[captureConnection isVideoMaxFrameDurationSupported]) {
}

     [captureConnection setVideoMaxFrameDuration:
         CoreMediaGlue::CMTimeMake(1, frameRate)];