delete web_components

pkg/web_components/CHANGELOG.md

-#### 0.10.0
-  * Updated to the `0.5.1` js version.
-  * **Breaking Change** To remain consistent with the js repository all the
-    `platform.js` has been replaced with `webcomponents.js`. Also, the default
-    file is now unminified, and the minified version is called
-    `webcomponents.min.js`.
-
-#### 0.9.0+1
-  * Remove all `.map` and `.concat.js` files during release mode.
-
-#### 0.9.0
-  * Updated to platform version 0.4.2, internally a deprecated API was removed,
-    hence the bump in the version number.
-
-  * split dart_support.js in two. dart_support.js only contains what is
-    necessary in order to use platform.js,
-    interop_support.js/interop_support.html can be imported separately when
-    providing Dart APIs for js custom elements.
-
-#### 0.8.0
-  * Re-apply changes from 0.7.1+1 and also cherry pick 
-    [efdbbc](https://github.com/polymer/CustomElements/commit/efdbbc) to fix
-    the customElementsTakeRecords function.
-  * **Breaking Change** The customElementsTakeRecords function now has an
-    an optional argument `node`. There is no longer a single global observer,
-    but one for each ShadowRoot and one for the main document. The observer that
-    is actually used defaults to the main document, but if `node` is supplied
-    then it will walk up the document tree and use the first observer that it
-    finds.
-
-#### 0.7.1+2
-  * Revert the change from 0.7.1+1 due to redness in FF/Safari/IE.
-
-#### 0.7.1+1
-  * Cherry pick [f280d](https://github.com/Polymer/ShadowDOM/commit/f280d) and
-    [165c3](https://github.com/Polymer/CustomElements/commit/165c3) to fix
-    memory leaks.
-
-#### 0.7.1
-  * Update to platform version 0.4.1-d214582.
-
-#### 0.7.0+1
-  * Cherry pick https://github.com/Polymer/ShadowDOM/pull/506 to fix IOS 8.
-
-#### 0.7.0
-  * Updated to 0.4.0-5a7353d release, with same cherry pick as 0.6.0+1.
-  * Many features were moved into the polymer package, this package is now
-    purely focused on polyfills.
-  * Change Platform.deliverDeclarations to 
-    Platform.consumeDeclarations(callback).
-  * Cherry pick https://github.com/Polymer/ShadowDOM/pull/505 to fix mem leak.
-
-#### 0.6.0+1
-  * Cherry pick https://github.com/Polymer/ShadowDOM/pull/500 to fix
-    http://dartbug.com/20141. Fixes getDefaultComputedStyle in firefox.
-
-#### 0.6.0
-  * Upgrades to platform master as of 8/25/2014 (see lib/build.log for details).
-    This is more recent than the 0.3.5 release as there were multiple breakages
-    that required updating past that.
-  * There is a bug in this version where selecting non-rendered elements doesn't
-    work, but it shouldn't affect most people. See 
-    https://github.com/Polymer/ShadowDOM/issues/495.
-
-#### 0.5.0+1
-  * Backward compatible change to prepare for upcoming change of the user agent
-    in Dartium.
-
-#### 0.5.0
-  * Upgrades to platform version 0.3.4-02a0f66 (see lib/build.log for details).
-
-#### 0.4.0
-  * Adds `registerDartType` and updates to platform 0.3.3-29065bc
-    (re-applies the changes in 0.3.5).
-
-#### 0.3.5+1
-  * Reverts back to what we had in 0.3.4. (The platform.js updates in 0.3.5 had
-    breaking changes so we are republishing it in 0.4.0)
-
-#### 0.3.5
-  * Added `registerDartType` to register a Dart API for a custom-element written
-    in Javascript.
-  * Updated to platform 0.3.3-29065bc
-
-#### 0.3.4
-  * Updated to platform 0.2.4 (see lib/build.log for details)