Bug 1470420: Change an nsAutoPtr to UniquePtr in the Loader. r=xidorn

MozReview-Commit-ID: 4KnjxHOybmG

layout/style/Loader.cpp

@@ -932,7 +932,7 @@ Loader::CreateSheet(nsIURI* aURI,
   MOZ_ASSERT(aSheet, "Null out param!");
 
   if (!mSheets) {
-    mSheets = new Sheets();
+    mSheets = MakeUnique<Sheets>();
   }
 
   *aSheet = nullptr;

layout/style/Loader.h

@@ -10,7 +10,6 @@
 #define mozilla_css_Loader_h
 
 #include "nsIPrincipal.h"
-#include "nsAutoPtr.h"
 #include "nsCompatibility.h"
 #include "nsCycleCollectionParticipant.h"
 #include "nsDataHashtable.h"
@@ -26,6 +25,7 @@
 #include "mozilla/Maybe.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/StyleSheet.h"
+#include "mozilla/UniquePtr.h"
 #include "mozilla/net/ReferrerPolicy.h"
 
 class nsICSSLoaderObserver;
@@ -590,7 +590,7 @@ private:
     nsDataHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, SheetLoadData*>
                       mPendingDatas; // weak refs
   };
-  nsAutoPtr<Sheets> mSheets;
+  UniquePtr<Sheets> mSheets;
 
   // The array of posted stylesheet loaded events (SheetLoadDatas) we have.
   // Note that these are rare.