code: function setLauncher(launcher) {
          if (!(launcher && launcher.launch)) {
              console.log("Invalid launcher object: ", launcher, new Error("LiveDevMultiBrowser.setLauncher()"));
              return;
          }
          _launcher = launcher;
      }
docs: Sets the current browser launcher mechanism to be used by live development
  (e.g., default browser, iframe-based browser, etc.)
  The launcher must provide the following method:
  
  - launch(url): Launch the given URL in the appropriate browser.
  
  @param {{launch: function(string)}} launcher