Change var blah_blah -> blahBlah.

chrome/browser/resources/file_manager/js/image_editor/image_util.js

 // Copyright (c) 2012 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.
 
 
 // Namespace object for the utilities.
 function ImageUtil() {}
 
 /**
  * Performance trace.
@@ skipping 284 matching lines @@
   context.fillRect(rect.left, rect.top, rect.width, rect.height);
 };
 
 /**
  * Fills the space between the two rectangles.
  * @param {CanvasRenderingContext2D} context Context to draw.
  * @param {Rect} inner Inner rectangle.
  * @param {Rect} outer Outer rectangle.
  */
 Rect.fillBetween = function(context, inner, outer) {
-  var inner_right = inner.left + inner.width;
-  var inner_bottom = inner.top + inner.height;
-  var outer_right = outer.left + outer.width;
-  var outer_bottom = outer.top + outer.height;
+  var innerRight = inner.left + inner.width;
+  var innerBottom = inner.top + inner.height;
+  var outerRight = outer.left + outer.width;
+  var outerBottom = outer.top + outer.height;
   if (inner.top > outer.top) {
     context.fillRect(
         outer.left, outer.top, outer.width, inner.top - outer.top);
   }
   if (inner.left > outer.left) {
     context.fillRect(
         outer.left, inner.top, inner.left - outer.left, inner.height);
   }
-  if (inner.width < outer_right) {
+  if (inner.width < outerRight) {
     context.fillRect(
-        inner_right, inner.top, outer_right - inner_right, inner.height);
+        innerRight, inner.top, outerRight - innerRight, inner.height);
   }
-  if (inner.height < outer_bottom) {
+  if (inner.height < outerBottom) {
     context.fillRect(
-        outer.left, inner_bottom, outer.width, outer_bottom - inner_bottom);
+        outer.left, innerBottom, outer.width, outerBottom - innerBottom);
   }
 };
 
 /**
  * Circle class.
  * @param {number} x X coordinate of circle center.
  * @param {number} y Y coordinate of circle center.
  * @param {number} r Radius.
  * @constructor
  */
@@ skipping 335 matching lines @@
  * @return {string} Full name.
  */
 ImageUtil.getMetricName = function(name) {
   return 'PhotoEditor.' + name;
 };
 
 /**
  * Used for metrics reporting, keep in sync with the histogram description.
  */
 ImageUtil.FILE_TYPES = ['jpg', 'png', 'gif', 'bmp', 'webp'];