[iOS] Upstream some stability code

ios/public/provider/chrome/browser/chrome_browser_provider.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 #define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 
 #include <CoreGraphics/CoreGraphics.h>
 
 #include <string>
@@ skipping 81 matching lines @@
   // Returns an instance of a CardUnmaskPromptView used to unmask Wallet cards.
   // The view is responsible for its own lifetime.
   virtual autofill::CardUnmaskPromptView* CreateCardUnmaskPromptView(
       autofill::CardUnmaskPromptController* controller);
   // Returns risk data used in Wallet requests.
   virtual std::string GetRiskData();
   // Returns product version with prefix.
   virtual std::string GetProductVersionWithPrefix(const std::string& prefix);
   // Returns a version string to be displayed in "About Chromium" dialog.
   virtual std::string GetVersionString();
+  // Version number, e.g. "6.0.490.1".
+  virtual std::string GetVersionNumber();
 };
 
 }  // namespace ios
 
 #endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_