wstring: convert all SetPageTitle APIs to use string16

chrome/browser/ui/views/tab_contents/native_tab_contents_view_gtk.cc

Index: chrome/browser/ui/views/tab_contents/native_tab_contents_view_gtk.cc
diff --git a/chrome/browser/ui/views/tab_contents/native_tab_contents_view_gtk.cc b/chrome/browser/ui/views/tab_contents/native_tab_contents_view_gtk.cc
index f0566e65698a2da547373012178c48c81590bcfc..6e8e6c2d5db639f5dc4dafcb431808aeb306ac5c 100644
--- a/chrome/browser/ui/views/tab_contents/native_tab_contents_view_gtk.cc
+++ b/chrome/browser/ui/views/tab_contents/native_tab_contents_view_gtk.cc
@@ -147,11 +147,11 @@ gfx::NativeWindow NativeTabContentsViewGtk::GetTopLevelNativeWindow() const {
   return window ? GTK_WINDOW(window) : NULL;
 }
 
-void NativeTabContentsViewGtk::SetPageTitle(const std::wstring& title) {
+void NativeTabContentsViewGtk::SetPageTitle(const string16& title) {
   // Set the window name to include the page title so it's easier to spot
   // when debugging (e.g. via xwininfo -tree).
   if (GDK_IS_WINDOW(GetNativeView()->window))
-    gdk_window_set_title(GetNativeView()->window, WideToUTF8(title).c_str());
+    gdk_window_set_title(GetNativeView()->window, UTF16ToUTF8(title).c_str());
 }
 
 void NativeTabContentsViewGtk::StartDragging(const WebDropData& drop_data,