Work more on getting things built with -Wimplicit-fallthrough.

This CL was uploaded by git cl split.

R=jinho.bang@samsung.com

Bug: 177475
Change-Id: I36c993f60404a15fb343c4ae174ea5cb18e959c6
Reviewed-on: https://chromium-review.googlesource.com/889944Reviewed-by: Jinho Bang <jinho.bang@samsung.com>
Cr-Commit-Position: refs/heads/master@{#532235}

third_party/WebKit/Source/modules/payments/PaymentRequest.cpp

@@ -1248,13 +1248,13 @@ void PaymentRequest::OnCanMakePayment(CanMakePaymentQueryResult result) {
   switch (result) {
     case CanMakePaymentQueryResult::WARNING_CAN_MAKE_PAYMENT:
       WarnIgnoringQueryQuotaForCanMakePayment(*GetExecutionContext());
-    // Intentionally fall through.
+      FALLTHROUGH;
     case CanMakePaymentQueryResult::CAN_MAKE_PAYMENT:
       can_make_payment_resolver_->Resolve(true);
       break;
     case CanMakePaymentQueryResult::WARNING_CANNOT_MAKE_PAYMENT:
       WarnIgnoringQueryQuotaForCanMakePayment(*GetExecutionContext());
-    // Intentionally fall through.
+      FALLTHROUGH;
     case CanMakePaymentQueryResult::CANNOT_MAKE_PAYMENT:
       can_make_payment_resolver_->Resolve(false);
       break;