Do not add superclass members to deferred loading deps
Do not add superclass members to deferred loading deps

When we changed this from the element model we changed

cls.implementation.forEachMember

to

elementEnvironment.forEachClassMember

The difference is that forEachMember doesn't iterate over
superclass members by default, while forEachClassMember does.

Change-Id: I25dffa7744317af9928505df3140b66df221c17e
Reviewed-on: https://dart-review.googlesource.com/20902
Reviewed-by: Sigmund Cherem <beaea8fd7d2a56555046ba4f362c8a93e3938576@google.com>
Commit-Queue: Harry Terkelsen <55e8f3f9525c3e9afde2c7c244ee420efad998f1@google.com>

dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk