Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/ash/chrome_keyboard_ui.h

Index: chrome/browser/ui/ash/chrome_keyboard_ui.h
diff --git a/chrome/browser/ui/ash/chrome_keyboard_ui.h b/chrome/browser/ui/ash/chrome_keyboard_ui.h
index 5be78b9c9973e7c78732a1b99f532ff274447fe3..0fc276fedbadad0d59e064bb320bdba44c7f25d4 100644
--- a/chrome/browser/ui/ash/chrome_keyboard_ui.h
+++ b/chrome/browser/ui/ash/chrome_keyboard_ui.h
@@ -5,8 +5,9 @@
 #ifndef CHROME_BROWSER_UI_ASH_CHROME_KEYBOARD_UI_H_
 #define CHROME_BROWSER_UI_ASH_CHROME_KEYBOARD_UI_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/keyboard/content/keyboard_ui_content.h"
 
@@ -63,7 +64,7 @@ class ChromeKeyboardUI : public keyboard::KeyboardUIContent,
   // content::WebContentsObserver overrides
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
 
-  scoped_ptr<keyboard::KeyboardControllerObserver> observer_;
+  std::unique_ptr<keyboard::KeyboardControllerObserver> observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeKeyboardUI);
 };