Disallow *ForDoc service lookups in element constructors

E.g. something like this should not be allowed:

class MyElement extends AMP.BAseElement {
  constructor() {
    this.action_ = actionServiceForDoc(...);
  }
}

Suffixes to disallow:

1. *ForDoc
2. *ForNode

Additional request is to disallow ForDoc and ForNode APIs to be called for Document and HTMLDocumentElement types. Possible?

[jridgewell]

ampdoc can’t be known until the node is connected to the document tree. The constructor is invoked much earlier than the custom-element’s connectedCallback.

[stale[bot]]

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