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

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

Index: ios/public/provider/chrome/browser/chrome_browser_provider.h
diff --git a/ios/public/provider/chrome/browser/chrome_browser_provider.h b/ios/public/provider/chrome/browser/chrome_browser_provider.h
index b8ec5ac84460596e0954656ae009ae0f60349348..60835250d32881ca97b89b5040752f45283facb3 100644
--- a/ios/public/provider/chrome/browser/chrome_browser_provider.h
+++ b/ios/public/provider/chrome/browser/chrome_browser_provider.h
@@ -7,12 +7,13 @@
 
 #include <CoreGraphics/CoreGraphics.h>
 #include <stddef.h>
+
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/favicon_base/favicon_callback.h"
 
 class AutocompleteProvider;
@@ -114,7 +115,7 @@ class ChromeBrowserProvider {
   virtual bool IsSafeBrowsingEnabled(const base::Closure& on_update_callback);
 
   // Returns the SyncedWindowDelegatesGetter implementation.
-  virtual scoped_ptr<browser_sync::SyncedWindowDelegatesGetter>
+  virtual std::unique_ptr<browser_sync::SyncedWindowDelegatesGetter>
   CreateSyncedWindowDelegatesGetter(ios::ChromeBrowserState* browser_state);
 };