DevTools: remove InspectorTest.assert from inspector-protocol tests

LayoutTests/inspector-protocol/heap-profiler/resources/heap-snapshot-common.js

 // This script is supposed to be evaluated in dummy inspector front-end which is loaded from
 // ../../../http/tests/inspector-protocol/resources/protocol-test.html and the relative paths
 // below are relative to that location.
 
 if (!window.WebInspector)
     window.WebInspector = {};
 InspectorTest.importScript("../../../../../Source/devtools/front_end/platform/utilities.js");
 InspectorTest.importScript("../../../../../Source/devtools/front_end/common/UIString.js");
 InspectorTest.importScript("../../../../../Source/devtools/front_end/profiler/HeapSnapshotCommon.js");
 InspectorTest.importScript("../../../../../Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js");
 InspectorTest.importScript("../../../../../Source/devtools/front_end/heap_snapshot_worker/JSHeapSnapshot.js");
 
 InspectorTest.fail = function(message)
 {
     InspectorTest.log("FAIL: " + message);
     InspectorTest.completeTest();
 }
 
-InspectorTest.assert = function(result, message)
-{
-    if (!result)
-        InspectorTest.fail(message);
-}
-
 InspectorTest.takeHeapSnapshot = function(callback)
 {
     var chunks = [];
     InspectorTest.eventHandler["HeapProfiler.addHeapSnapshotChunk"] = function(messageObject)
     {
         chunks.push(messageObject["params"]["chunk"]);
     }
 
     function didTakeHeapSnapshot(messageObject)
     {
         var serializedSnapshot = chunks.join("");
         var parsed = JSON.parse(serializedSnapshot);
         parsed.nodes = new Uint32Array(parsed.nodes);
         parsed.edges = new Uint32Array(parsed.edges);
         var snapshot = new WebInspector.JSHeapSnapshot(parsed, new WebInspector.HeapSnapshotProgress());
         callback(snapshot);
         InspectorTest.log("SUCCESS: didGetHeapSnapshot");
         InspectorTest.completeTest();
     }
     InspectorTest.sendCommand("HeapProfiler.takeHeapSnapshot", {}, didTakeHeapSnapshot);
 }