Bug 1325234 (part 7) - Streamline nsIWidget::GetSelectionAsPlaintext. r=mstange.

This patch changes it from |NS_IMETHOD| to |virtual MOZ_MUST_USE nsresult|.

--HG--
extra : rebase_source : 3af9e5f5c2a558db38c2f98ca6740794aaae08e7

widget/cocoa/nsChildView.h

@@ -375,7 +375,8 @@ public:
 
   NS_IMETHOD        ActivateNativeMenuItemAt(const nsAString& indexString) override;
   NS_IMETHOD        ForceUpdateNativeMenuAt(const nsAString& indexString) override;
-  NS_IMETHOD        GetSelectionAsPlaintext(nsAString& aResult) override;
+  virtual MOZ_MUST_USE nsresult
+                    GetSelectionAsPlaintext(nsAString& aResult) override;
 
   NS_IMETHOD_(void) SetInputContext(const InputContext& aContext,
                                     const InputContextAction& aAction) override;

widget/cocoa/nsChildView.mm

@@ -6175,7 +6175,7 @@ provideDataForType:(NSString*)aType
   return command.mSucceeded && command.mIsEnabled;
 }
 
-NS_IMETHODIMP
+nsresult
 nsChildView::GetSelectionAsPlaintext(nsAString& aResult)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;

widget/nsIWidget.h

@@ -1724,7 +1724,7 @@ public:
      * @param aResult - the current text selection. Is empty if no selection.
      * @return nsresult - whether or not aResult was assigned the selected text.
      */
-    NS_IMETHOD
+    virtual MOZ_MUST_USE nsresult
     GetSelectionAsPlaintext(nsAString& aResult)
     {
       return NS_ERROR_NOT_IMPLEMENTED;