Bug 1432977 part 2. Remove nsIDOMHTMLElement's spellcheck attribute. r=mccr8

MozReview-Commit-ID: B07hMx3LAed

dom/html/nsGenericHTMLElement.h

@@ -270,10 +270,6 @@ public:
   nsSize GetWidthHeightForImage(RefPtr<imgRequestProxy>& aImageRequest);
 
   // XPIDL methods
-  NS_IMETHOD GetSpellcheck(bool* aSpellcheck) final override {
-    *aSpellcheck = Spellcheck();
-    return NS_OK;
-  }
   NS_IMETHOD GetOffsetWidth(int32_t* aOffsetWidth) final override {
     *aOffsetWidth = OffsetWidth();
     return NS_OK;

dom/interfaces/html/nsIDOMHTMLElement.idl

@@ -22,9 +22,6 @@ interface nsIDOMHTMLMenuElement;
 [uuid(b0c42392-d0e7-4f6a-beb5-a698ce648945)]
 interface nsIDOMHTMLElement : nsIDOMElement
 {
-  readonly attribute boolean          spellcheck;
-
-
   // CSSOM View
   readonly attribute long             offsetWidth;
   readonly attribute long             offsetHeight;

editor/libeditor/EditorBase.cpp

@@ -64,6 +64,7 @@
 #include "nsError.h"                    // for NS_OK, etc.
 #include "nsFocusManager.h"             // for nsFocusManager
 #include "nsFrameSelection.h"           // for nsFrameSelection
+#include "nsGenericHTMLElement.h"       // for nsGenericHTMLElement
 #include "nsGkAtoms.h"                  // for nsGkAtoms, nsGkAtoms::dir
 #include "nsIAbsorbingTransaction.h"    // for nsIAbsorbingTransaction
 #include "nsAtom.h"                    // for nsAtom
@@ -451,7 +452,7 @@ EditorBase::GetDesiredSpellCheckState()
     return false;
   }
 
-  nsCOMPtr<nsIDOMHTMLElement> element = do_QueryInterface(content);
+  auto element = nsGenericHTMLElement::FromContent(content);
   if (!element) {
     return false;
   }
@@ -464,10 +465,7 @@ EditorBase::GetDesiredSpellCheckState()
     return doc && doc->IsEditingOn();
   }
 
-  bool enable;
-  element->GetSpellcheck(&enable);
-
-  return enable;
+  return element->Spellcheck();
 }
 
 NS_IMETHODIMP