Cleanup: Pass std::string as const reference if possible

extensions/browser/guest_view/web_view/web_view_renderer_state.h

Index: extensions/browser/guest_view/web_view/web_view_renderer_state.h
diff --git a/extensions/browser/guest_view/web_view/web_view_renderer_state.h b/extensions/browser/guest_view/web_view/web_view_renderer_state.h
index ad2de379278fc7025c4afc32afda60a274c00855..7ee5ace4ab08dbf0bed020a29e71f3f1051adda8 100644
--- a/extensions/browser/guest_view/web_view/web_view_renderer_state.h
+++ b/extensions/browser/guest_view/web_view/web_view_renderer_state.h
@@ -81,9 +81,8 @@ class WebViewRendererState {
     int web_view_count;
     std::string partition_id;
     WebViewPartitionInfo() {}
-    WebViewPartitionInfo(int count, std::string partition):
-      web_view_count(count),
-      partition_id(partition) {}
+    WebViewPartitionInfo(int count, const std::string& partition)
+        : web_view_count(count), partition_id(partition) {}
   };
 
   using WebViewPartitionIDMap = std::map<int, WebViewPartitionInfo>;