This replaces the begin/endMixinApplication events which were used in both
```
class A = B with M;
```
and
```
class A extends B with M { }
``
with different events for each of the above situations.
This change facilitates properly handling class declarations of the form
```
class A with M { }
```
Removed event:
* beginMixinApplication
* endMixinApplication
Added events:
* handleNamedMixinApplicationWithClause
* handleClassWithClause
* handleClassNoWithClause
Change-Id: Ifa0ecfd7ff8c408087ad78036ad35ba4a00728c6
Reviewed-on: https://dart-review.googlesource.com/73940
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
danrubel
a9cc6f0f19