[ios] Fix typo: include header instead of mm file.

This caused a link error, duplicate symbols, in a jumbo build
experiment. How it ever worked in normal builds we'll never know.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I4136a153aa989f2187d745f291658ac4e05fa6db
Reviewed-on: https://chromium-review.googlesource.com/1244461
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#594357}
diff --git a/ios/chrome/browser/payments/ios_payment_instrument_launcher.mm b/ios/chrome/browser/payments/ios_payment_instrument_launcher.mm
index ce57a45..8c6c598 100644
--- a/ios/chrome/browser/payments/ios_payment_instrument_launcher.mm
+++ b/ios/chrome/browser/payments/ios_payment_instrument_launcher.mm
@@ -20,7 +20,7 @@
 #include "ios/web/public/navigation_manager.h"
 #include "ios/web/public/ssl_status.h"
 #include "ios/web/public/web_state/web_state.h"
-#include "net/base/mac/url_conversions.mm"
+#include "net/base/mac/url_conversions.h"
 #include "net/base/url_util.h"
 #include "net/cert/x509_certificate.h"
 #include "net/cert/x509_util.h"