Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/page/Navigator.cpp

Index: Source/core/page/Navigator.cpp
diff --git a/Source/core/page/Navigator.cpp b/Source/core/page/Navigator.cpp
index 9d6aca81816bade24eb0cccff89339d65305133d..76020dbd1bc10521f205cf8c29910e5611e87bff 100644
--- a/Source/core/page/Navigator.cpp
+++ b/Source/core/page/Navigator.cpp
@@ -82,12 +82,12 @@ String Navigator::userAgent() const
 {
     if (!m_frame)
         return String();
-        
+
     // If the frame is already detached, FrameLoader::userAgent may malfunction, because it calls a client method
     // that uses frame's WebView (at least, in Mac WebKit).
     if (!m_frame->page())
         return String();
-        
+
     return m_frame->loader()->userAgent(m_frame->document()->url());
 }