MacVideoDecodeAccelerator::Initialize() needs to inspect its |profile| param.

content/common/gpu/media/mac_video_decode_accelerator.mm

Index: content/common/gpu/media/mac_video_decode_accelerator.mm
diff --git a/content/common/gpu/media/mac_video_decode_accelerator.mm b/content/common/gpu/media/mac_video_decode_accelerator.mm
index 94b67808df60cf78ecfa23be8ef778adb97cbc66..e07dacb16d2eefb3a5486fc57ff9383bb617aff7 100644
--- a/content/common/gpu/media/mac_video_decode_accelerator.mm
+++ b/content/common/gpu/media/mac_video_decode_accelerator.mm
@@ -102,6 +102,9 @@ MacVideoDecodeAccelerator::MacVideoDecodeAccelerator(
 bool MacVideoDecodeAccelerator::Initialize(media::VideoCodecProfile profile) {
   DCHECK(CalledOnValidThread());
 
+  if (profile < media::H264PROFILE_MIN || profile > media::H264PROFILE_MAX)
+    return false;
+
   IOSurfaceSupport* io_surface_support = IOSurfaceSupport::Initialize();
   if (!io_surface_support)
     return false;