Extracted MetafilePlayer interface from printing::MetafilePlayer.

android_webview/renderer/print_web_view_helper_linux.cc

Index: android_webview/renderer/print_web_view_helper_linux.cc
diff --git a/android_webview/renderer/print_web_view_helper_linux.cc b/android_webview/renderer/print_web_view_helper_linux.cc
index 02298375c6b89497ea52a70080216bab1a79400f..6895b252f5eca5247608843e10fc13cba123ee42 100644
--- a/android_webview/renderer/print_web_view_helper_linux.cc
+++ b/android_webview/renderer/print_web_view_helper_linux.cc
@@ -52,8 +52,8 @@ bool PrintWebViewHelper::RenderPreviewPage(
   } else if (print_preview_context_.IsModifiable() &&
              print_preview_context_.generate_draft_pages()) {
     DCHECK(!draft_metafile.get());
-    draft_metafile.reset(
-        print_preview_context_.metafile()->GetMetafileForCurrentPage());
+    draft_metafile =
+        print_preview_context_.metafile()->GetMetafileForCurrentPage();
   }
   return PreviewPageRendered(page_number, draft_metafile.get());
 }