MD Settings: push controlled indicators totally to the right

This is for a better right key line now that controls are more
consistently on the right of md-settings.

R=dschuyler@chromium.org
BUG=673953
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2611183003
Cr-Commit-Position: refs/heads/master@{#441847}

chrome/browser/resources/settings/controls/controlled_radio_button.html

@@ -14,6 +14,10 @@
         outline: none;
       }
 
+      #radioButton {
+        flex: 1;
+      }
+
       :host([controlled_]) {
         /* Disable pointer events for this whole element, as outer on-tap gets
          * triggered when clicking/tapping anywhere in :host. */