DevTools: make debugger's rawLocationToUILocation return nullable type

third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 905 matching lines @@
     this._uiLocations.set(location.id(), uiLocation);
     this._breakpoint._replaceUILocation(oldUILocation, uiLocation);
   }
 
   /**
    * @param {!SDK.DebuggerModel.Location} location
    * @return {boolean}
    */
   _addResolvedLocation(location) {
     var uiLocation = this._debuggerWorkspaceBinding.rawLocationToUILocation(location);
+    if (!uiLocation)
+      return false;
     var breakpoint = this._breakpoint._breakpointManager.findBreakpoint(
         uiLocation.uiSourceCode, uiLocation.lineNumber, uiLocation.columnNumber);
     if (breakpoint && breakpoint !== this._breakpoint) {
       // location clash
       this._breakpoint.remove();
       return false;
     }
     this._debuggerWorkspaceBinding.createLiveLocation(
         location, this._locationUpdated.bind(this, location), this._liveLocations);
     return true;
@@ skipping 136 matching lines @@
     this.url = breakpoint._url;
     this.lineNumber = breakpoint.lineNumber();
     this.columnNumber = breakpoint.columnNumber();
     this.condition = breakpoint.condition();
     this.enabled = breakpoint.enabled();
   }
 };
 
 /** @type {!Bindings.BreakpointManager} */
 Bindings.breakpointManager;