Restore CefRenderProcessHandler::OnBeforeNavigation (issue #1076). This method is still needed for some use cases due to issue #1129.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1519 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/internal/cef_types.h

@@ -1479,6 +1479,18 @@ enum cef_focus_source_t {
   FOCUS_SOURCE_SYSTEM,
 };
 
+///
+// Navigation types.
+///
+enum cef_navigation_type_t {
+  NAVIGATION_LINK_CLICKED = 0,
+  NAVIGATION_FORM_SUBMITTED,
+  NAVIGATION_BACK_FORWARD,
+  NAVIGATION_RELOAD,
+  NAVIGATION_FORM_RESUBMITTED,
+  NAVIGATION_OTHER,
+};
+
 ///
 // Supported XML encoding types. The parser supports ASCII, ISO-8859-1, and
 // UTF16 (LE and BE) by default. All other types must be translated to UTF8