Fixed unhandled exception on ios 7.1.2

[IJsLauw]

Description

On iOS 7.1.2 (possible other lower versions as well) videojs throws an unhandled error which breaks the player. (first pull request, so bear with me)

Specific Changes proposed

Try catch around chrome fix (which breaks in safari on iOS 7.1.2) in handleTechReady_

Requirements Checklist

• [x ] Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

Error: Unable to delete property.

handleTechReady_@....

[gkatsev]

There's some discussion around whether we even still need that block here #3188
but I'm ok with pulling it in, at least as a work around.

[gkatsev]

this should be using our log helper. Something like:

log('deleting tag.poster throws in some browsers', e);

[IJsLauw]

using your log helper now

[gkatsev]

LGTM.

[misteroneill]

LGTM