Fix cpplint errors.

atom/browser/browser.cc

@@ -118,7 +118,9 @@ void Browser::NotifyAndShutdown() {
 
 bool Browser::HandleBeforeQuit() {
   bool prevent_default = false;
-  FOR_EACH_OBSERVER(BrowserObserver, observers_, OnBeforeQuit(&prevent_default));
+  FOR_EACH_OBSERVER(BrowserObserver,
+                    observers_,
+                    OnBeforeQuit(&prevent_default));
 
   return !prevent_default;
 }

atom/browser/browser_observer.h

@@ -13,7 +13,7 @@ class BrowserObserver {
  public:
   // The browser is about to close all windows.
   virtual void OnBeforeQuit(bool* prevent_default) {}
-  
+
   // The browser has closed all windows and will quit.
   virtual void OnWillQuit(bool* prevent_default) {}