Revert 195187 "Revert 195143 "Prevent chrome.app JSON schema fro..."

Revert 195187 "Revert 195143 "Prevent chrome.app JSON schema fro..."

Last revert failed. Who knows why.

> Revert 195143 "Prevent chrome.app JSON schema from loading on ev..."
> 
> Small perf regression.
> 
> > Prevent chrome.app JSON schema from loading on every page
> > 
> > The app API along with app.window and app.runtime have been converted to use
> > the feature system. Bindings are not added to the chrome object for unavailable
> > APIs that are children of available APIs. For example, if chrome.app is
> > available, we will not add lazy bindings to chrome for app.window and
> > app.runtime. This eliminates the need to load the app schema, because we no
> > longer need to get chrome.app to add the app.runtime and app.window bindings.
> > 
> > BUG=55316
> > 
> > Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=194837
> > 
> > Review URL: https://chromiumcodereview.appspot.com/13604005
> 
> TBR=cduvall@chromium.org
> 
> Review URL: https://codereview.chromium.org/14241030

TBR=kalman@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=195199

[not at google - send to devlin, 2013-04-19 15:07:00]

Committed patchset #1 manually as r195199.