Cancels payment request when Settings is tapped, and opens the Autofill settings page.

ios/chrome/browser/payments/payment_request_manager.mm

Index: ios/chrome/browser/payments/payment_request_manager.mm
diff --git a/ios/chrome/browser/payments/payment_request_manager.mm b/ios/chrome/browser/payments/payment_request_manager.mm
index 56fbab0920d246eafb29f94aee59d5d5677583bf..bbf9749a5220eeadeb66ef1e9d6dfdfe0534d394 100644
--- a/ios/chrome/browser/payments/payment_request_manager.mm
+++ b/ios/chrome/browser/payments/payment_request_manager.mm
@@ -21,6 +21,9 @@
 #include "ios/chrome/browser/payments/payment_request.h"
 #import "ios/chrome/browser/payments/payment_request_coordinator.h"
 #include "ios/chrome/browser/procedural_block_types.h"
+#import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
+#import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
+#import "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #include "ios/web/public/favicon_status.h"
 #include "ios/web/public/navigation_item.h"
 #include "ios/web/public/navigation_manager.h"
@@ -48,6 +51,9 @@ const NSTimeInterval kNoopInterval = 0.1;
 // PaymentResponse.complete().
 const NSTimeInterval kTimeoutInterval = 60.0;
 
+NSString* kAbortMessage = @"The payment request was aborted.";
+NSString* kCancelMessage = @"The payment request was canceled.";
+
 }  // namespace
 
 @interface PaymentRequestManager ()<CRWWebStateObserver,
@@ -225,8 +231,7 @@ const NSTimeInterval kTimeoutInterval = 60.0;
 }
 
 - (void)cancelRequest {
-  [self terminateRequestWithErrorMessage:@"The payment request was canceled."
-                                callback:nil];
+  [self terminateRequestWithErrorMessage:kCancelMessage callback:nil];
 }
 
 - (void)terminateRequestWithErrorMessage:(NSString*)errorMessage
@@ -387,9 +392,8 @@ const NSTimeInterval kTimeoutInterval = 60.0;
     // Early return if the manager has been deallocated.
     if (!strongSelf)
       return;
-    [strongSelf
-        terminateRequestWithErrorMessage:@"The payment request was aborted."
-                                callback:cancellationCallback];
+    [strongSelf terminateRequestWithErrorMessage:kAbortMessage

[marq (ping after 24h), 2017/04/06 15:16:45]

Delete lines 391-394 and just call the method on weakSelf

[macourteau, 2017/04/06 15:24:00]

Done.

+                                        callback:cancellationCallback];
   };
 
   [_paymentRequestCoordinator displayErrorWithCallback:callback];
@@ -410,9 +414,7 @@ const NSTimeInterval kTimeoutInterval = 60.0;
     // Early return if the manager has been deallocated.
     if (!strongSelf)
       return;
-    [strongSelf
-        terminateRequestWithErrorMessage:@"The payment request was canceled."
-                                callback:nil];
+    [strongSelf terminateRequestWithErrorMessage:kCancelMessage callback:nil];

[marq (ping after 24h), 2017/04/06 15:16:45]

Delete lines 413-416 and just call the method on weakSelf.

[macourteau, 2017/04/06 15:23:59]

Done.

   };
 
   [_paymentRequestCoordinator displayErrorWithCallback:callback];
@@ -535,8 +537,20 @@ const NSTimeInterval kTimeoutInterval = 60.0;
 
 - (void)paymentRequestCoordinatorDidCancel:
     (PaymentRequestCoordinator*)coordinator {
-  [self terminateRequestWithErrorMessage:@"The payment request was canceled."
-                                callback:nil];
+  [self terminateRequestWithErrorMessage:kCancelMessage callback:nil];
+}
+
+- (void)paymentRequestCoordinatorDidSelectSettings:
+    (PaymentRequestCoordinator*)coordinator {
+  ProceduralBlockWithBool callback = ^(BOOL) {
+    UIWindow* mainWindow = [[UIApplication sharedApplication] keyWindow];
+    DCHECK(mainWindow);
+    GenericChromeCommand* command =
+        [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_AUTOFILL_SETTINGS];
+    [mainWindow chromeExecuteCommand:command];
+  };
+
+  [self terminateRequestWithErrorMessage:kCancelMessage callback:callback];
 }
 
 - (void)paymentRequestCoordinator:(PaymentRequestCoordinator*)coordinator