Suppress leveldb recursion warning on official builds

third_party/leveldatabase/BUILD.gn

Index: third_party/leveldatabase/BUILD.gn
diff --git a/third_party/leveldatabase/BUILD.gn b/third_party/leveldatabase/BUILD.gn
index 0057c0eed73bb6fd78752fa00e598e4883d3298f..04cb36d337cd2089a81bc330dc165147bf2f3b97 100644
--- a/third_party/leveldatabase/BUILD.gn
+++ b/third_party/leveldatabase/BUILD.gn
@@ -116,6 +116,11 @@ static_library("leveldatabase") {
 
   if (is_win) {
     cflags = [ "/wd4018" ]  # Signed/unsigned mismatch in comparison.
+
+    if (is_official_build) {
+      # Function recursive on all control paths, crbug.com/620018
+      cflags += [ "/wd4717" ]
+    }
   }
 }