Bug 1517241 - Rename nsIDocument to mozilla::dom::Document. r=smaug

Summary: Really sorry for the size of the patch. It's mostly automatic
s/nsIDocument/Document/ but I had to fix up in a bunch of places manually to
add the right namespacing and such.

Overall it's not a very interesting patch I think.

nsDocument.cpp turns into Document.cpp, nsIDocument.h into Document.h and
nsIDocumentInlines.h into DocumentInlines.h.

I also changed a bunch of nsCOMPtr usage to RefPtr, but not all of it.

While fixing up some of the bits I also removed some unneeded OwnerDoc() null
checks and such, but I didn't do anything riskier than that.

dom/html/HTMLScriptElement.cpp

@@ -6,7 +6,7 @@
 
 #include "nsGkAtoms.h"
 #include "nsStyleConsts.h"
-#include "nsIDocument.h"
+#include "mozilla/dom/Document.h"
 #include "nsIURI.h"
 #include "nsNetUtil.h"
 #include "nsContentUtils.h"
@@ -47,8 +47,7 @@ NS_IMPL_ISUPPORTS_INHERITED(HTMLScriptElement, nsGenericHTMLElement,
                             nsIScriptLoaderObserver, nsIScriptElement,
                             nsIMutationObserver)
 
-nsresult HTMLScriptElement::BindToTree(nsIDocument* aDocument,
-                                       nsIContent* aParent,
+nsresult HTMLScriptElement::BindToTree(Document* aDocument, nsIContent* aParent,
                                        nsIContent* aBindingParent) {
   nsresult rv =
       nsGenericHTMLElement::BindToTree(aDocument, aParent, aBindingParent);
@@ -168,7 +167,7 @@ void HTMLScriptElement::GetScriptCharset(nsAString& charset) {
   GetCharset(charset);
 }
 
-void HTMLScriptElement::FreezeExecutionAttrs(nsIDocument* aOwnerDoc) {
+void HTMLScriptElement::FreezeExecutionAttrs(Document* aOwnerDoc) {
   if (mFrozen) {
     return;
   }