Run clang-format on .js files in c/b/r/md_extensions

chrome/browser/resources/md_extensions/code_section.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('extensions', function() {
   'use strict';
 
   var CodeSection = Polymer({
     is: 'extensions-code-section',
 
@@ skipping 17 matching lines @@
       couldNotDisplayCode: String,
     },
 
     /**
      * Returns true if no code could be displayed (e.g. because the file could
      * not be loaded).
      * @return {boolean}
      */
     isEmpty: function() {
       return !this.code ||
-             (!this.code.beforeHighlight && !this.code.highlight &&
-              !this.code.afterHighlight);
+          (!this.code.beforeHighlight && !this.code.highlight &&

[Devlin, 2017/06/17 02:25:39]

this now violates the rectangle rule, which I *thought* was part of our style,
but now only appears briefly (though this style violates that brief rule).

Do you know if a) style preference has changed or b) we can tweak the js format
to respect rectangle-rule style?

[Dan Beam, 2017/06/19 23:01:24]

there's an internal reference to this rectangle rule
go/js#formatting-where-to-break but i don't think this new style violates it/

can you explain to me why you think this violates the rectangle rule?  note:
it's not about visually appearing like a rectangle.

[Devlin, 2017/06/20 16:02:06]

The rule says you should be able to "draw" a rectangle around each "subtree"
(strange phrasing, but it's what it uses).  In this case, you can't draw a
rectangle around the return value (excluding the return statement).

That said, if this is only really described in the internal docs, it doesn't
really apply to chromium, so maybe this is fine?

+           !this.code.afterHighlight);
     },
 
     /**
      * Computes the content of the line numbers span, which basically just
      * contains 1\n2\n3\n... for the number of lines.
      * @return {string}
      * @private
      */
     computeLineNumbersContent_: function() {
       if (!this.code)
         return '';
 
-      var lines = [this.code.beforeHighlight,
-                   this.code.highlight,
-                   this.code.afterHighlight].join('').match(/\n/g);
+      var lines = [
+        this.code.beforeHighlight, this.code.highlight, this.code.afterHighlight
+      ].join('').match(/\n/g);
       var lineCount = lines ? lines.length : 0;
       var textContent = '';
       for (var i = 1; i <= lineCount; ++i)
         textContent += i + '\n';
       return textContent;
     },
   });
 
   return {CodeSection: CodeSection};
 });