Re-applying r76324, which was reverted during a WebKit rollback.

webkit/glue/webpreferences.cc

Index: webkit/glue/webpreferences.cc
diff --git a/webkit/glue/webpreferences.cc b/webkit/glue/webpreferences.cc
index 252b83d6273bf4a90f0e98f8cbe1437b5253e546..0edac2fe60a57524313f4fc870947a2856226b36 100644
--- a/webkit/glue/webpreferences.cc
+++ b/webkit/glue/webpreferences.cc
@@ -72,7 +72,8 @@ WebPreferences::WebPreferences()
       accelerated_2d_canvas_enabled(false),
       accelerated_plugins_enabled(false),
       memory_info_enabled(false),
-      interactive_form_validation_enabled(true) {
+      interactive_form_validation_enabled(true),
+      fullscreen_enabled(false) {
 }
 
 WebPreferences::~WebPreferences() {
@@ -205,4 +206,6 @@ void WebPreferences::Apply(WebView* web_view) const {
 
   settings->setInteractiveFormValidationEnabled(
       interactive_form_validation_enabled);
+
+  settings->setFullScreenEnabled(fullscreen_enabled);
 }