[Cronet] Build static libcronet.a for iOS with complete dependencies.

components/cronet/ios/sample/cronet_sample_app_delegate.h

Index: components/cronet/ios/sample/cronet_sample_app_delegate.h
diff --git a/components/cronet/ios/sample/cronet_sample_app_delegate.h b/components/cronet/ios/sample/cronet_sample_app_delegate.h
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+++ b/components/cronet/ios/sample/cronet_sample_app_delegate.h
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+// Copyright 2017 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 COMPONENTS_CRONET_IOS_SAMPLE_CRONET_SAMPLE_APP_DELEGATE_H_
+#define COMPONENTS_CRONET_IOS_SAMPLE_CRONET_SAMPLE_APP_DELEGATE_H_
+
+#import <UIKit/UIKit.h>
+
+@class CronetSampleViewController;
+
+// The main app controller and UIApplicationDelegate.
+@interface CronetSampleAppDelegate : UIResponder<UIApplicationDelegate>
+
+@property(strong, nonatomic) UIWindow* window;
+@property(strong, nonatomic) CronetSampleViewController* viewController;
+
+@end
+
+#endif  // COMPONENTS_CRONET_IOS_SAMPLE_CRONET_SAMPLE_APP_DELEGATE_H_