Bug 1485676 - Rename TabTarget.makeRemote to TabTarget.attach. r=jdescottes

Summary:
Now that all the "remoting" of this method has been moved to TargetFactory.createTargetForTab,
we should rename this method to what it does now. It mostly call attach requests
of the target actor and its child console actor.
It also "connect" the webextension target actor, but I would like to eventually move that
outside of TabTarget.attach, like makeRemote.

Depends On D4078

Reviewers: yulia!

Tags: #secure-revision

Bug #: 1485676

Differential Revision: https://phabricator.services.mozilla.com/D6161

MozReview-Commit-ID: KmFi1LIUBga

devtools/shared/fronts/csscoverage.js

@@ -110,11 +110,11 @@ const knownFronts = new WeakMap();
 
 /**
  * Create a CSSUsageFront only when needed (returns a promise)
- * For notes on target.makeRemote(), see
+ * For notes on target.attach(), see
  * https://bugzilla.mozilla.org/show_bug.cgi?id=1016330#c7
  */
 exports.getUsage = function(trgt) {
-  return trgt.makeRemote().then(() => {
+  return trgt.attach().then(() => {
     let front = knownFronts.get(trgt.client);
     if (front == null && trgt.form.cssUsageActor != null) {
       front = new CSSUsageFront(trgt.client, trgt.form);