Remove the Dromaeo and TodoMVC samples.

samples/third_party/dromaeo/web/README

-This is a port of the Dromaeo benchmark (http://dromaeo.com/) to Dart.
-See the attached LICENSE file in this directory.
-
-To run the native Dart versions on Dartium: 
-
-(1) Use a Dartium chrome binary to open index.html in this directory.
-By default, this will run JS vs a native Dart version (dart:html)
-designed to match the JS for speed.
-
-To run compiled versions on standard browsers:
-
-(1) Execute python ./generate_dart2js_tests.py to create frog
-and dart2js variants.
-
-(2) Use a standard browser to open index-js.html in this directory.
-By default, this will run JS vs a dart2js compiled Dart version
-(dart2js:html) designed to match the JS for speed.
-
--------------------------------------------------------
-
-Note, you can run more variants and at a finer granularity.  Dart
-Dromaeo includes the following modes:
-
-- js : The original JS.
-- dart : Dart, running natively (Dartium only).
-- frog : Dart, compiled to JS with Frog.
-- dart2js : Dart, compiled to JS with dart2js.
-
-It also includes the following versions for Dart modes:
-
-- dom : The old deprecated dart:dom.
-- html : The new dart:html, using fast path APIs to match JS.
-
-Finally, Dart Dromaeo runs the following suites of benchmarks:
-- attributes : Setting and getting DOM node attributes.
-- modify : Creating and injecting DOM nodes into a document.
-- query : Querying DOM elements in a document.
-- traverse : Traversing a DOM structure.
-
-You can specify a disjunction of conjunctions from the three buckets
-above.  Examples:
-
-To run the attributes suite on JS, Dartium, and Dart2JS, load:
-
-- index.html?js&attributes|dart&attributes&html|dart2js&attributes&html
-
-To run the query suite with Dart2JS, load:
-
-- index-js.html?dart&query&html
-
-To run all tests in Dartium, load:
-
-- index.html?js|dart|frog|dart2js
-
-To run all tests (except the native Dart) in a regular browser, load:
-
-- index-js.html?js|frog|dart2js