mac: Make component_unittests build with the 10.11 SDK.

* Pass non-nil arguments in a few places.  These are all delegate
  methods implemented by chrome code that doesn't look at the
  parameters, so just pass a nearby object of the same type.  (Most
  of the time this looks like the right object to pass, too!)
* For the deviceBrowser: parameter, no good object was available,
  so add a method to ImageCaptureDeviceManager to hand out
  a good object to pass.
* Rename device_browser() to device_browser_delegate() to be
  less confusing wrt the new object.
* Finally, mark initWithDictionary: as NS_DESIGNATED_INITIALIZER
  so the compiler doesn't complain about
  [MockICCameraDevice init] not calling a designated initializer.
  Since this is an internal API, we're playing with fire anyways.
  (This requires moving the declaration from a category to a class
  extension.)

No intended behavior change.

BUG=517914

Review URL: https://codereview.chromium.org/1396773006

Cr-Commit-Position: refs/heads/master@{#353567}

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