Bug 1840732 Part 2: Remove unnecessary includes from accessible/basetypes, r=Jamie

This revision removes unnecessary include directives from cpp files in the
accessible/basetypes directory. These suggestions came from the Include What You
Use tool.

Depends on D182288

Differential Revision: https://phabricator.services.mozilla.com/D182397

accessible/basetypes/Accessible.cpp

@@ -4,7 +4,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "Accessible.h"
-#include "AccGroupInfo.h"
 #include "ARIAMap.h"
 #include "nsAccUtils.h"
 #include "nsIURI.h"

accessible/basetypes/HyperTextAccessibleBase.cpp

@@ -5,10 +5,8 @@
 
 #include "HyperTextAccessibleBase.h"
 
-#include "AccAttributes.h"
 #include "mozilla/a11y/Accessible.h"
 #include "nsAccUtils.h"
-#include "mozilla/a11y/RemoteAccessible.h"
 #include "TextLeafRange.h"
 #include "TextRange.h"