remove pkg/browser/lib/interop.js

remove pkg/browser/lib/interop.js
it's not really needed -- the same functionality can be achieved in dart:js's implementation

R=justinfagnani@google.com

Committed: https://code.google.com/p/dart/source/detail?r=32943

[Jennifer Messerly, 2014-02-19 00:37:23]

https://codereview.chromium.org/164913007/diff/1/sdk/lib/js/dart2js/js_dart2j...
File sdk/lib/js/dart2js/js_dart2js.dart (right):

https://codereview.chromium.org/164913007/diff/1/sdk/lib/js/dart2js/js_dart2j...
sdk/lib/js/dart2js/js_dart2js.dart:487: final _dartProxyCtor = JS('', 'function
DartObject(o) { this.o = o; }');
we could call this function anything, but for debugging having a name seems
nice.

[Jennifer Messerly, 2014-02-19 00:37:50]

note: this is actually deprecating with a friendly msg, not removing just yet :)

[Jennifer Messerly, 2014-02-20 22:03:53]

ping :)  this would really help remove one extra script tag a user needs to
worry about.

[justinfagnani, 2014-02-21 23:20:12]

lgtm

[Jennifer Messerly, 2014-02-21 23:35:15]

Committed patchset #1 manually as r32943 (presubmit successful).