Add shared GlobalEventHandlers IDL

Source/core/dom/GlobalEventHandlers.h

Index: Source/core/dom/GlobalEventHandlers.h
diff --git a/Source/core/css/xhtmlmp.css b/Source/core/dom/GlobalEventHandlers.h
similarity index 86%
copy from Source/core/css/xhtmlmp.css
copy to Source/core/dom/GlobalEventHandlers.h
index 11ea1cf1a031cfbf2694983c810bab1f925d99ae..4df0ef0c48b0e9ea320f326463ef179de5aae4b8 100644
--- a/Source/core/css/xhtmlmp.css
+++ b/Source/core/dom/GlobalEventHandlers.h
@@ -27,11 +27,14 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-/* Default styles for XHTML Mobile Profile documents where they differ from html.css */
+#ifndef GlobalEventHandlers_h
+#define GlobalEventHandlers_h
 
-@viewport {
-    width: auto;
-    /* Ideally these should be removed. Currently here to avoid test result regressions. */
-    min-zoom: 0.25;
-    max-zoom: 5;
+namespace WebCore {
+
+namespace GlobalEventHandlers {
 }
+
+} // namespace
+
+#endif