Use javascript strict mode throughout a number of net-internals files.

chrome/browser/resources/net_internals/capture_view.js

 // Copyright (c) 2011 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.
 
 /**
  * This view displays controls for capturing network events.
  */
+var CaptureView = (function() {
+  'use strict';
 
-var CaptureView = (function() {
   // IDs for special HTML elements in capture_view.html
-  const MAIN_BOX_ID = 'capture-view-tab-content';
-  const BYTE_LOGGING_CHECKBOX_ID = 'capture-view-byte-logging-checkbox';
-  const PASSIVELY_CAPTURED_COUNT_ID = 'capture-view-passively-captured-count';
-  const ACTIVELY_CAPTURED_COUNT_ID = 'capture-view-actively-captured-count';
-  const DELETE_ALL_ID = 'capture-view-delete-all';
-  const TIP_ANCHOR_ID = 'capture-view-tip-anchor';
-  const TIP_DIV_ID = 'capture-view-tip-div';
+  var MAIN_BOX_ID = 'capture-view-tab-content';
+  var BYTE_LOGGING_CHECKBOX_ID = 'capture-view-byte-logging-checkbox';
+  var PASSIVELY_CAPTURED_COUNT_ID = 'capture-view-passively-captured-count';
+  var ACTIVELY_CAPTURED_COUNT_ID = 'capture-view-actively-captured-count';
+  var DELETE_ALL_ID = 'capture-view-delete-all';
+  var TIP_ANCHOR_ID = 'capture-view-tip-anchor';
+  var TIP_DIV_ID = 'capture-view-tip-div';
 
   // We inherit from DivView.
   var superClass = DivView;
 
   /**
    * @constructor
    */
   function CaptureView() {
+    assertFirstConstructorCall(CaptureView);
+
     // Call superclass's constructor.
     superClass.call(this, MAIN_BOX_ID);
 
     var byteLoggingCheckbox = $(BYTE_LOGGING_CHECKBOX_ID);
     byteLoggingCheckbox.onclick =
         this.onSetByteLogging_.bind(this, byteLoggingCheckbox);
 
     this.activelyCapturedCountBox_ = $(ACTIVELY_CAPTURED_COUNT_ID);
     this.passivelyCapturedCountBox_ = $(PASSIVELY_CAPTURED_COUNT_ID);
     $(DELETE_ALL_ID).onclick =
@@ skipping 73 matching lines @@
       if (byteLoggingCheckbox.checked) {
         g_browser.setLogLevel(LogLevelType.LOG_ALL);
       } else {
         g_browser.setLogLevel(LogLevelType.LOG_ALL_BUT_BYTES);
       }
     }
   };
 
   return CaptureView;
 })();