Revert of webrtc-internals: dont remove tab (patchset #1 id:1 of...

Revert of webrtc-internals: dont remove tab (patchset #1 id:1 of https://codereview.chromium.org/2739443002/ )

Reason for revert:
This is breaking some Mac builds
https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests/builds/14781

Original issue's description:
> webrtc-internals: dont remove tab
>
> instead of removing the tab when a peerconnection is garbage collected
> this adds a symbol which removes the tab on click.
>
> BUG=416876
>
> Review-Url: https://codereview.chromium.org/2739443002
> Cr-Commit-Position: refs/heads/master@{#455743}
> Committed: https://chromium.googlesource.com/chromium/src/+/b31e6f5fc2cae4ce8efdb57eb995a0c2e583dd75

TBR=guidou@chromium.org,tommi@chromium.org,philipp.hancke@googlemail.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=416876

Review-Url: https://codereview.chromium.org/2745433004
Cr-Commit-Position: refs/heads/master@{#455760}

content/browser/resources/media/tab_view.js

@@ -85,17 +85,6 @@ var TabView = (function() {
       }
     },
 
-    makeTabRemovable: function(id) {
-      if (!this.tabElements_[id])
-        return;
-      var close = document.createElement('a');
-      close.textContent = '[x]';
-      close.addEventListener('click', function() {
-        this.removeTab(id);
-      }.bind(this));
-      this.tabElements_[id].head.appendChild(close);
-    },
-
     /**
      * Switches the specified tab into view.
      *

content/browser/resources/media/webrtc_internals.js

@@ -181,8 +181,7 @@ function removePeerConnection(data) {
   var element = $(getPeerConnectionId(data));
   if (element) {
     delete peerConnectionDataStore[element.id];
-    // add a [x] button to close this tab instead of removing it immediately.
-    tabView.makeTabRemovable(element.id);
+    tabView.removeTab(element.id);
   }
 }