Use framework includes in ios/web_view/shell.

ios/web_view/public/ChromeWebView.h

Index: ios/web_view/public/ChromeWebView.h
diff --git a/ios/web_view/public/ChromeWebView.h b/ios/web_view/public/ChromeWebView.h
new file mode 100644
index 0000000000000000000000000000000000000000..8e44d130bf945803e6ef7aa190bc173a4b3e31e6
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+++ b/ios/web_view/public/ChromeWebView.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 IOS_WEB_VIEW_PUBLIC_CHROME_WEB_VIEW_H_
+#define IOS_WEB_VIEW_PUBLIC_CHROME_WEB_VIEW_H_
+
+#import <ChromeWebView/cwv.h>
+#import <ChromeWebView/cwv_delegate.h>
+#import <ChromeWebView/cwv_html_element.h>
+#import <ChromeWebView/cwv_navigation_action.h>
+#import <ChromeWebView/cwv_navigation_delegate.h>
+#import <ChromeWebView/cwv_translate_delegate.h>
+#import <ChromeWebView/cwv_translate_manager.h>
+#import <ChromeWebView/cwv_ui_delegate.h>
+#import <ChromeWebView/cwv_web_view.h>
+#import <ChromeWebView/cwv_web_view_configuration.h>
+
+#endif  // IOS_WEB_VIEW_PUBLIC_CHROME_WEB_VIEW_H_