Revert r217952 to make behavior of horizontal scroll bar in page chrome://extensions keep consisten…

chrome/browser/resources/extensions/extensions.js

Index: chrome/browser/resources/extensions/extensions.js
diff --git a/chrome/browser/resources/extensions/extensions.js b/chrome/browser/resources/extensions/extensions.js
index b1d5a575d7bbddc1a6c8fafb85b2b01c3bf67db3..f71292ea4a8c66ebbda3bfbf0e75cb12d7bea9af 100644
--- a/chrome/browser/resources/extensions/extensions.js
+++ b/chrome/browser/resources/extensions/extensions.js
@@ -356,6 +356,15 @@ cr.define('extensions', function() {
    *     are hidden.
    */
   ExtensionSettings.showOverlay = function(node) {
+    var pageDiv = $('extension-settings');
+    if (node) {
+      pageDiv.style.width = window.getComputedStyle(pageDiv).width;
+      document.body.classList.add('no-scroll');
+    } else {
+      document.body.classList.remove('no-scroll');
+      pageDiv.style.width = '';
+    }
+
     var currentlyShowingOverlay = ExtensionSettings.getCurrentOverlay();
     if (currentlyShowingOverlay)
       currentlyShowingOverlay.classList.remove('showing');