Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/ios_chrome_io_thread.h

Index: ios/chrome/browser/ios_chrome_io_thread.h
diff --git a/ios/chrome/browser/ios_chrome_io_thread.h b/ios/chrome/browser/ios_chrome_io_thread.h
index 34d4507ed1baf2f5b69bfd3310fcc93df5809a01..7827dcca2bdc39613b80b2ee153ec93dfcec891b 100644
--- a/ios/chrome/browser/ios_chrome_io_thread.h
+++ b/ios/chrome/browser/ios_chrome_io_thread.h
@@ -9,6 +9,7 @@
 #include <stdint.h>
 
 #include <map>
+#include <memory>
 #include <set>
 #include <string>
 #include <vector>
@@ -16,7 +17,6 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string_piece.h"
 #include "base/time/time.h"
@@ -105,31 +105,32 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
 
     // The "system" NetworkDelegate, used for BrowserState-agnostic network
     // events.
-    scoped_ptr<net::NetworkDelegate> system_network_delegate;
-    scoped_ptr<net::HostResolver> host_resolver;
-    scoped_ptr<net::CertVerifier> cert_verifier;
+    std::unique_ptr<net::NetworkDelegate> system_network_delegate;
+    std::unique_ptr<net::HostResolver> host_resolver;
+    std::unique_ptr<net::CertVerifier> cert_verifier;
     // The ChannelIDService must outlive the HttpTransactionFactory.
-    scoped_ptr<net::ChannelIDService> system_channel_id_service;
+    std::unique_ptr<net::ChannelIDService> system_channel_id_service;
     // This TransportSecurityState doesn't load or save any state. It's only
     // used to enforce pinning for system requests and will only use built-in
     // pins.
-    scoped_ptr<net::TransportSecurityState> transport_security_state;
-    scoped_ptr<net::CTVerifier> cert_transparency_verifier;
-    scoped_ptr<net::CTPolicyEnforcer> ct_policy_enforcer;
+    std::unique_ptr<net::TransportSecurityState> transport_security_state;
+    std::unique_ptr<net::CTVerifier> cert_transparency_verifier;
+    std::unique_ptr<net::CTPolicyEnforcer> ct_policy_enforcer;
     scoped_refptr<net::SSLConfigService> ssl_config_service;
-    scoped_ptr<net::HttpAuthPreferences> http_auth_preferences;
-    scoped_ptr<net::HttpAuthHandlerFactory> http_auth_handler_factory;
-    scoped_ptr<net::HttpServerProperties> http_server_properties;
-    scoped_ptr<net::URLRequestBackoffManager> url_request_backoff_manager;
-    scoped_ptr<net::ProxyService> system_proxy_service;
-    scoped_ptr<net::HttpNetworkSession> system_http_network_session;
-    scoped_ptr<net::HttpTransactionFactory> system_http_transaction_factory;
-    scoped_ptr<net::URLRequestJobFactory> system_url_request_job_factory;
-    scoped_ptr<net::URLRequestContext> system_request_context;
+    std::unique_ptr<net::HttpAuthPreferences> http_auth_preferences;
+    std::unique_ptr<net::HttpAuthHandlerFactory> http_auth_handler_factory;
+    std::unique_ptr<net::HttpServerProperties> http_server_properties;
+    std::unique_ptr<net::URLRequestBackoffManager> url_request_backoff_manager;
+    std::unique_ptr<net::ProxyService> system_proxy_service;
+    std::unique_ptr<net::HttpNetworkSession> system_http_network_session;
+    std::unique_ptr<net::HttpTransactionFactory>
+        system_http_transaction_factory;
+    std::unique_ptr<net::URLRequestJobFactory> system_url_request_job_factory;
+    std::unique_ptr<net::URLRequestContext> system_request_context;
     SystemRequestContextLeakChecker system_request_context_leak_checker;
-    scoped_ptr<net::CookieStore> system_cookie_store;
-    scoped_ptr<net::HttpUserAgentSettings> http_user_agent_settings;
-    scoped_ptr<net::NetworkQualityEstimator> network_quality_estimator;
+    std::unique_ptr<net::CookieStore> system_cookie_store;
+    std::unique_ptr<net::HttpUserAgentSettings> http_user_agent_settings;
+    std::unique_ptr<net::NetworkQualityEstimator> network_quality_estimator;
     uint16_t testing_fixed_http_port;
     uint16_t testing_fixed_https_port;
     Optional<bool> enable_tcp_fast_open_for_ssl;
@@ -375,17 +376,18 @@ class IOSChromeIOThread : public web::WebThreadDelegate {
 
   // Observer that logs network changes to the ChromeNetLog.
   class LoggingNetworkChangeObserver;
-  scoped_ptr<LoggingNetworkChangeObserver> network_change_observer_;
+  std::unique_ptr<LoggingNetworkChangeObserver> network_change_observer_;
 
   // This is an instance of the default SSLConfigServiceManager for the current
   // platform and it gets SSL preferences from local_state object.
-  scoped_ptr<ssl_config::SSLConfigServiceManager> ssl_config_service_manager_;
+  std::unique_ptr<ssl_config::SSLConfigServiceManager>
+      ssl_config_service_manager_;
 
   // These member variables are initialized by a task posted to the IO thread,
   // which gets posted by calling certain member functions of IOSChromeIOThread.
-  scoped_ptr<net::ProxyConfigService> system_proxy_config_service_;
+  std::unique_ptr<net::ProxyConfigService> system_proxy_config_service_;
 
-  scoped_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
+  std::unique_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
 
   scoped_refptr<net::URLRequestContextGetter>
       system_url_request_context_getter_;