Bug 1937785 - Make PresShell::GetMobileViewportManager return a raw pointer. r=botond

Differential Revision: https://phabricator.services.mozilla.com/D234261

Author: hiikezoe

layout/base/PresShell.cpp

@@ -11346,7 +11346,7 @@ void PresShell::SetIsActive(bool aIsActive) {
   }
 }
 
-RefPtr<MobileViewportManager> PresShell::GetMobileViewportManager() const {
+MobileViewportManager* PresShell::GetMobileViewportManager() const {
   return mMobileViewportManager;
 }
 

layout/base/PresShell.h

@@ -418,7 +418,7 @@ class PresShell final : public nsStubDocumentObserver,
    * viewport. Will return null in situations where we don't have a mobile
    * viewport, and for documents that are not the root content document.
    */
-  RefPtr<MobileViewportManager> GetMobileViewportManager() const;
+  MobileViewportManager* GetMobileViewportManager() const;
 
   /**
    * Called when document load completes.