[DevTools] Fix one more backwards compatibility breakage.

Source/devtools/front_end/devtools.js

 // Copyright 2014 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.
 
 (function(window) {
 
 // DevToolsAPI ----------------------------------------------------------------
 
 /**
  * @constructor
@@ skipping 764 matching lines @@
 
 window.InspectorFrontendHost = new InspectorFrontendHostImpl();
 
 // DevToolsApp ---------------------------------------------------------------
 
 /**
  * @suppressGlobalPropertiesCheck
  */
 function installBackwardsCompatibility()
 {
+    if (window.location.search.indexOf("remoteFrontend") === -1)
+        return;
+
     /**
      * @this {CSSStyleDeclaration}
      */
     function getValue(property)
     {
         // Note that |property| comes from another context, so we can't use === here.
         if (property == "padding-left") {
             return {
                 /**
                  * @suppressReceiverCheck
@@ skipping 56 matching lines @@
     uiTests.testSuiteReady = function(testSuiteConstructor, testBase)
     {
         uiTests._testSuite = testSuiteConstructor(window.domAutomationController);
         uiTests._tryRun();
     };
 
     window.uiTests = uiTests;
 }
 
 })(window);