Do not use CRWWebController in FormSuggestionControllerTest.

ios/chrome/browser/autofill/form_input_accessory_view_controller.h

Index: ios/chrome/browser/autofill/form_input_accessory_view_controller.h
diff --git a/ios/chrome/browser/autofill/form_input_accessory_view_controller.h b/ios/chrome/browser/autofill/form_input_accessory_view_controller.h
index bd9226c9e1ed5e417e2bcef292ab42e84cd27b3d..7ab244a6df1808941d3dc9e5c9463c77a3d85066 100644
--- a/ios/chrome/browser/autofill/form_input_accessory_view_controller.h
+++ b/ios/chrome/browser/autofill/form_input_accessory_view_controller.h
@@ -80,6 +80,11 @@ typedef void (^AccessoryViewReadyCompletion)(
 @interface FormInputAccessoryViewController
     : NSObject<CRWWebStateObserver, FormInputAccessoryViewDelegate>
 
+// The current web view proxy.
+// TODO(crbug.com/727716): This property should not be a part of the public
+// interface, it is used in tests as a backdoor.
+@property(nonatomic, readonly) id<CRWWebViewProxy> webViewProxy;
+
 // Initializes a new controller with the specified |providers| of input
 // accessory views.
 - (instancetype)initWithWebState:(web::WebState*)webState