Add deprecation warnings to old powerful features on insecure origins.

Source/core/dom/Fullscreen.cpp

Index: Source/core/dom/Fullscreen.cpp
diff --git a/Source/core/dom/Fullscreen.cpp b/Source/core/dom/Fullscreen.cpp
index 552abaaa706744252e467126c67bdaaa4c3dd2ef..ec727d37a124b17d6646910862dab0a6d44e9453 100644
--- a/Source/core/dom/Fullscreen.cpp
+++ b/Source/core/dom/Fullscreen.cpp
@@ -204,6 +204,18 @@ void Fullscreen::documentWasDisposed()
 
 void Fullscreen::requestFullscreen(Element& element, RequestType requestType)
 {
+    // It is required by isPrivilegedContext() but isn't
+    // actually used. This could be used later if a warning is shown in the
+    // developer console.
+    String errorMessage;
+    if (document()->isPrivilegedContext(errorMessage)) {
+        UseCounter::count(document(), UseCounter::FullscreenSecureOrigin);
+    } else {
+        UseCounter::countDeprecation(document(), UseCounter::FullscreenInsecureOrigin);
+    }

[mlamouri (slow - plz ping), 2015/04/30 05:23:53]

No need for { and }

[jww, 2015/04/30 17:28:44]

Done.

+    //    logPowerfulFeatureInsecureOriginWarning(document(), "fullscreen");
+    //}

[mlamouri (slow - plz ping), 2015/04/30 05:23:53]

Remove?

[jww, 2015/04/30 17:28:45]

Yikes, sorry! Done.

+
     // Ignore this request if the document is not in a live frame.
     if (!document()->isActive())
         return;