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

AVFoundation: Allow exceptions when checking if max frame rate setting is supported.

Addressing some sporadic crashes, see http://crbug.com/327532, with 
"Selector not found" when trying to query the AVCaptureConnection if 
it supports setting max video frame rate, at [1].

Beyond that, this problem started affecting all non-HD cameras in Mac
Os X < 10.9 -- see log in http://crbug.com/328096 --.

This CL checks if the selector is recognised before attemping to use it.

[1] https://code.google.com/p/chromium/codesearch#chromium/src/media/video/capture/mac/video_capture_device_avfoundation_mac.mm&q=isvideomaxframe&sq=package:chromium&type=cs&l=174
BUG=288562, 327532, 328096
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=241056

[mcasas, 2013-12-16 10:53:37]

Hi tommi@ PTAL!

[tommi (sloooow) - chröme, 2013-12-16 11:52:41]

Have you verified that this fixes the problem?
It would be good to get an objective-c reviewer to look at this but fwiw -
rubber stamp lgtm.

[mcasas, 2013-12-16 12:11:08]

rsesek@, can you PTAL?

I've verified this fix in Debug configs both in
Mavericks+MacBookAir+FaceTimeHD and
Mountain Lion+MacBookPro+FaceTime, and they
work ok, no crash.

[commit-bot: I haz the power, 2013-12-16 13:12:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mcasas@chromium.org/99353005/1

[commit-bot: I haz the power, 2013-12-16 13:48:48]

Retried try job too often on mac_rel for step(s) base_unittests, browser_tests,
interactive_ui_tests, net_unittests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-12-16 14:12:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mcasas@chromium.org/99353005/1

[commit-bot: I haz the power, 2013-12-16 14:57:22]

Retried try job too often on linux_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[Robert Sesek, 2013-12-16 15:36:49]

This seems wrong. Why is that selector being sent in the first place?

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

https://codereview.chromium.org/99353005/diff/1/media/video/capture/mac/video...
File media/video/capture/mac/video_capture_device_avfoundation_mac.mm (right):

https://codereview.chromium.org/99353005/diff/1/media/video/capture/mac/video...
media/video/capture/mac/video_capture_device_avfoundation_mac.mm:175: if
([captureConnection isVideoMaxFrameDurationSupported]) {
Instead, if ([captureConnection
respondsToSelector:@selector(isVideoMaxFrameDurationSupported] &&
[captureConnection isVideoMaxFrameDurationSupported]) {
}

[mcasas, 2013-12-16 16:45:47]

rsesek@, PTAL!

[Robert Sesek, 2013-12-16 17:20:56]

LGTM

You may need to do this for Min, too.

https://codereview.chromium.org/99353005/diff/20001/media/video/capture/mac/v...
File media/video/capture/mac/video_capture_device_avfoundation_mac.mm (right):

https://codereview.chromium.org/99353005/diff/20001/media/video/capture/mac/v...
media/video/capture/mac/video_capture_device_avfoundation_mac.mm:11: #include
"base/mac/scoped_nsexception_enabler.h"
Remove

[commit-bot: I haz the power, 2013-12-16 17:28:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mcasas@chromium.org/99353005/50001

[commit-bot: I haz the power, 2013-12-16 18:50:24]

Retried try job too often on linux_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-12-16 19:10:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mcasas@chromium.org/99353005/50001

[commit-bot: I haz the power, 2013-12-16 20:54:08]

Retried try job too often on linux_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-12-16 21:20:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mcasas@chromium.org/99353005/50001

[commit-bot: I haz the power, 2013-12-16 23:02:51]

Change committed as 241056