Remove babel from DEPS and (dart2js) IE support from test infra.

Tested: N/A
Change-Id: Ib1804b49c40cac9be52e732090e8160444ebb48d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/417948
Commit-Queue: Mayank Patke <fishythefish@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>
Reviewed-by: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>

docs/Building.md

@@ -158,9 +158,9 @@ All tests are executed using the `test.py` script under `tools/`.  You need to u
 $ ./tools/build.py --mode release --arch ia32 most run_ffi_unit_tests
 ```
 
-Now you can run all tests as follows (Safari, Firefox, Chrome, and IE must be installed, if you want to run the tests on them):
+Now you can run all tests as follows (Safari, Firefox, and Chrome must be installed, if you want to run the tests on them):
 ```bash
-$ ./tools/test.py -mrelease --arch=ia32 --compiler=dartk,dart2js --runtime=vm,d8,chrome,firefox,[safari,ie10]
+$ ./tools/test.py -mrelease --arch=ia32 --compiler=dartk,dart2js --runtime=vm,d8,chrome,firefox,[safari]
 ```
 Specify the compiler used (optional -- only necessary if you are compiling to JavaScript (required for most browsers), the default is "none") and a runtime (where the code will be run).
 

docs/Status-files.md

@@ -13,7 +13,7 @@ and runtimes we maintain and support.
 We have tens of thousands of tests and a single test may be run across a
 combinatorial explosion of configurations. Does the static analyzer report any
 errors on it? In strong mode? Does it run on the standalone VM? Can dart2js
-compile it? Does the resulting code run in Chrome? Firefox? IE? In checked mode?
+compile it? Does the resulting code run in Chrome? Firefox? In checked mode?
 With minification on? You get the idea.
 
 Many tests are only meaningful for certain combinations of configurations. A