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

dom/script/ScriptElement.h

@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ScriptElement_h
+#define mozilla_dom_ScriptElement_h
+
+#include "mozilla/Attributes.h"
+#include "nsIScriptLoaderObserver.h"
+#include "nsIScriptElement.h"
+#include "nsStubMutationObserver.h"
+
+namespace mozilla {
+namespace dom {
+
+/**
+ * Baseclass useful for script elements (such as <xhtml:script> and
+ * <svg:script>). Currently the class assumes that only the 'src'
+ * attribute and the children of the class affect what script to execute.
+ */
+
+class ScriptElement : public nsIScriptElement,
+                      public nsStubMutationObserver
+{
+public:
+  // nsIScriptLoaderObserver
+  NS_DECL_NSISCRIPTLOADEROBSERVER
+
+  // nsIMutationObserver
+  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+
+  explicit ScriptElement(FromParser aFromParser)
+    : nsIScriptElement(aFromParser)
+  {
+  }
+
+  virtual nsresult FireErrorEvent() override;
+
+protected:
+  // Internal methods
+
+  /**
+   * Check if this element contains any script, linked or inline
+   */
+  virtual bool HasScriptContent() = 0;
+
+  virtual bool MaybeProcessScript() override;
+};
+
+} // dom namespace
+} // mozilla namespace
+
+#endif // mozilla_dom_ScriptElement_h