DevTools: Add test multi-target-breakpoint-manager.html

LayoutTests/inspector/sources/debugger/breakpoint-manager.html

Index: LayoutTests/inspector/sources/debugger/breakpoint-manager.html
diff --git a/LayoutTests/inspector/sources/debugger/breakpoint-manager.html b/LayoutTests/inspector/sources/debugger/breakpoint-manager.html
index f6f6bd838451d7b22d4a7d42d823952a8db1426a..42f41ee6f927fe71ec3ca396dc158384d4bdb3da 100644
--- a/LayoutTests/inspector/sources/debugger/breakpoint-manager.html
+++ b/LayoutTests/inspector/sources/debugger/breakpoint-manager.html
@@ -36,18 +36,10 @@ function test()
     serializedBreakpoints.push(createBreakpoint("a.js", 20, "", false));
     serializedBreakpoints.push(createBreakpoint("b.js", 3, "", true));
 
-    var mockTarget = {
-
-        id: function()
-        {
-            return 1;
-        }
-    };
     var targetManager = new WebInspector.TargetManager();
+    var mockTarget = InspectorTest.createMockTarget(targetManager, 1);
     targetManager._targets.push(mockTarget);
-
     InspectorTest.setupLiveLocationSniffers();
-    InspectorTest.initializeDefaultMappingOnTarget(mockTarget);
 
     var addUISourceCode = InspectorTest.addUISourceCode.bind(null, mockTarget);
     var createBreakpointManager = InspectorTest.createBreakpointManager.bind(null, targetManager);