Switch SupportsUserData uses to use unique_ptr.

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 
 #include "base/auto_reset.h"
 #include "base/mac/foundation_util.h"
@@ skipping 103 matching lines @@
   }
   ~OmniboxViewMacState() override {}
 
   const OmniboxEditModel::State model_state;
   const bool has_focus;
   const NSRange selection;
 };
 
 // Accessors for storing and getting the state from the tab.
 void StoreStateToTab(WebContents* tab,
-                     OmniboxViewMacState* state) {
-  tab->SetUserData(kOmniboxViewMacStateKey, state);
+                     std::unique_ptr<OmniboxViewMacState> state) {
+  tab->SetUserData(kOmniboxViewMacStateKey, std::move(state));
 }
 
 const OmniboxViewMacState* GetStateFromTab(const WebContents* tab) {
   return static_cast<OmniboxViewMacState*>(
       tab->GetUserData(&kOmniboxViewMacStateKey));
 }
 
 }  // namespace
 
 // static
@@ skipping 79 matching lines @@
 
   NSRange range;
   if (hasFocus) {
     range = GetSelectedRange();
   } else {
     // If we are not focused, there is no selection.  Manufacture
     // something reasonable in case it starts to matter in the future.
     range = NSMakeRange(0, GetTextLength());
   }
 
-  OmniboxViewMacState* state =
-      new OmniboxViewMacState(model()->GetStateForTabSwitch(), hasFocus, range);
-  StoreStateToTab(tab, state);
+  StoreStateToTab(tab, base::MakeUnique<OmniboxViewMacState>(
+                           model()->GetStateForTabSwitch(), hasFocus, range));
 }
 
 void OmniboxViewMac::OnTabChanged(const WebContents* web_contents) {
   const OmniboxViewMacState* state = GetStateFromTab(web_contents);
   model()->RestoreState(state ? &state->model_state : NULL);
   // Restore focus and selection if they were present when the tab
   // was switched away.
   if (state && state->has_focus) {
     // TODO(shess): Unfortunately, there is no safe way to update
     // this because TabStripController -selectTabWithContents:* is
@@ skipping 845 matching lines @@
                               display_text);
   NSDictionary* notification_info = @{
       NSAccessibilityAnnouncementKey : announcement,
       NSAccessibilityPriorityKey :     @(NSAccessibilityPriorityHigh)
   };
   NSAccessibilityPostNotificationWithUserInfo(
       [field_ window],
       NSAccessibilityAnnouncementRequestedNotification,
       notification_info);
 }