chore(typings): re-enable type-checking on the browser trees

[alexeagle]

this was accidentally disabled in 5b5d31f
And we have accumulated some typings errors in the meantime.
One thing we did is introduce dependencies with typing conflicts.
See #4507
My solution here is to remove the upgrade module from this compilation unit. + @mhevery

[mhevery]

Does your change stop running the upgrade tests? If it is just deployment think it is fine, but if it disables tests, then we need to look for a quick solution

[IgorMinar]

why do we need this now?

[alexeagle]

Because angularjs/angular.d.ts has a relative reference path pointing here.
In fact, this has not correctly type-checked ever since Misko wrote the upgrade package. We just weren't running the typechecker on the browser tree. It wasn't type-checked by node_tree either because of include: ['angular2/**', 'benchpress/**', '**/e2e_test/**'],. So @mhevery has been getting a free ride!

[alexeagle]

Tests can't run if the typescript files are never transpiled. Let's figure out a quick fix tomorrow - maybe another *_tree.ts file.
Note this change is one blocking my new hotness (check out https://github.com/alexeagle/angular2-distro/blob/master/README.md 😄 )

[alexeagle]

Updated to fix the upgrade package - removed the dependency on the angular typings and jquery, instead we hand-wrote a subset of angular.d.ts just for the upgrade package.

PTAL

[mary-poppins]

Merging PR #4508 on behalf of @alexeagle to branch presubmit-alexeagle-pr-4508.

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