[Mac]Port browser_keyevents_browsertest.cc and browser_focus_uitest.cc to Mac.

base/keyboard_code_conversion_gtk.cc

Index: base/keyboard_code_conversion_gtk.cc
diff --git a/base/keyboard_code_conversion_gtk.cc b/base/keyboard_code_conversion_gtk.cc
index 91de891822de3ca0499a20689343ba68c6dbc172..9e6bfd17e4fedd76d0e97fce8f88062a822ad527 100644
--- a/base/keyboard_code_conversion_gtk.cc
+++ b/base/keyboard_code_conversion_gtk.cc
@@ -33,9 +33,6 @@
 
 // WindowsKeyCodeForGdkKeyCode is copied from platform/gtk/KeyEventGtk.cpp
 
-#ifndef BASE_KEYBOARD_CODE_CONVERSION_GTK_H_
-#define BASE_KEYBOARD_CODE_CONVERSION_GTK_H_
-
 #include "base/keyboard_code_conversion_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
@@ -615,6 +612,4 @@ int GdkKeyCodeForWindowsKeyCode(base::KeyboardCode keycode, bool shift) {
     }
 }
 
-} // namespace
-
-#endif  // BASE_KEYBOARD_CODE_CONVERSION_GTK_H_
+}  // namespace base