DevTools: do not pro-actively query all StyleSheets for their content.

third_party/WebKit/LayoutTests/inspector/sources/debugger-breakpoints/breakpoint-manager.js

 var initialize_BreakpointManagerTest = function() {
 
 InspectorTest.uiSourceCodes = {};
 
 InspectorTest.dumpTargetIds = false;
 
 InspectorTest.initializeDefaultMappingOnTarget = function(target)
 {
     var defaultMapping = {
         rawLocationToUILocation: function(rawLocation)
@@ skipping 201 matching lines @@
             return uiSourceCode;
         }
     }
 }
 
 InspectorTest.addUISourceCode = function(target, breakpointManager, url, doNotSetSourceMapping, doNotAddScript)
 {
     if (!doNotAddScript)
         InspectorTest.addScript(target, breakpointManager, url);
     InspectorTest.addResult("  Adding UISourceCode: " + url);
-    var contentProvider = new WebInspector.StaticContentProvider(url, WebInspector.resourceTypes.Script, Promise.resolve(""));
+    var contentProvider = WebInspector.StaticContentProvider.fromString(url, WebInspector.resourceTypes.Script, "");
     var binding = breakpointManager._debuggerWorkspaceBinding;
     var uiSourceCode = InspectorTest.testNetworkProject.addFile(contentProvider, null);
     InspectorTest.uiSourceCodes[url] = uiSourceCode;
     if (!doNotSetSourceMapping) {
         breakpointManager._debuggerWorkspaceBinding.setSourceMapping(target, uiSourceCode, breakpointManager.defaultMapping);
         breakpointManager._debuggerWorkspaceBinding.updateLocations(target.debuggerModel.scriptForId(url));
     }
     return uiSourceCode;
 }
 
@@ skipping 149 matching lines @@
     }
 
     function finish()
     {
         InspectorTest.dumpBreakpointLocations(breakpointManager);
         next();
     }
 }
 
 }