Bug 1362119 - part 1 - Moving dom/base/Script{Loader,Element}.* in dom/script, r=ehsan

This patch does these things:

1. it moves nsScriptElement, nsScriptLoader, ScriptSettings, nsIScriptElement
   and nsIScriptLoaderObserver in dom/script
2. it renames nsScriptElement to mozilla::dom::ScriptElement
3. it renames nsScriptLaoder to mozilla::dom::ScriptLoader

parser/htmlparser/nsParser.cpp

@@ -28,7 +28,6 @@
 #include "nsIFragmentContentSink.h"
 #include "nsStreamUtils.h"
 #include "nsHTMLTokenizer.h"
-#include "nsScriptLoader.h"
 #include "nsDataHashtable.h"
 #include "nsXPCOMCIDInternal.h"
 #include "nsMimeTypes.h"
@@ -40,6 +39,7 @@
 #include "nsIHTMLContentSink.h"
 
 #include "mozilla/dom/EncodingUtils.h"
+#include "mozilla/dom/ScriptLoader.h"
 #include "mozilla/BinarySearch.h"
 
 using namespace mozilla;