Delete duplicate file

There is already a web-speech.json file in the repository, so this is a duplicate.
data update
Merge pull request #458 from AurelioDeRosa/patch-2

Delete duplicated file
Merge pull request #460 from jaydeepw/master

Add Battery-Status API feature data
data update
data update
Add text-decoration-* feature
Add link to Flexyboxes
data update
Chrome 34 and above do not require prefix
Merge pull request #463 from ai/text-decoration

Add text-decoration-* feature
Merge pull request #465 from DuncanMacWeb/patch-2

Add link to Flexyboxes
data update
merge upstream
WebVTT supported in Firefox 28
Page Visibility API works in Chrome Mobile 33.0
Opera 20+ no longer need prefix for PageVisibility
input type color disabled in Firefox 28
Added Speech Synthesis API
Added User Timing API