Reland of Stop passing raw pointers to base::Value API in c/b/ui

chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc

Index: chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
diff --git a/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc b/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
index 65576ae8c34a1564339f73fcabfc979a81b829a7..cde991f9060b060ce9311fe3c7c813d09165e251 100644
--- a/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
+++ b/chrome/browser/ui/zoom/chrome_zoom_level_prefs.cc
@@ -6,7 +6,10 @@
 
 #include <stddef.h>
 
+#include <memory>
+
 #include "base/bind.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "chrome/common/chrome_constants.h"
@@ -109,17 +112,21 @@ void ChromeZoomLevelPrefs::OnZoomLevelChanged(
   bool modification_is_removal =
       content::ZoomValuesEqual(level, host_zoom_map_->GetDefaultZoomLevel());
 
-  base::DictionaryValue* host_zoom_dictionary = nullptr;
+  base::DictionaryValue* host_zoom_dictionary_weak = nullptr;
   if (!host_zoom_dictionaries->GetDictionary(partition_key_,
-                                             &host_zoom_dictionary)) {
-    host_zoom_dictionary = new base::DictionaryValue();
-    host_zoom_dictionaries->Set(partition_key_, host_zoom_dictionary);
+                                             &host_zoom_dictionary_weak)) {
+    auto host_zoom_dictionary = base::MakeUnique<base::DictionaryValue>();
+    host_zoom_dictionary_weak = host_zoom_dictionary.get();
+    host_zoom_dictionaries->Set(partition_key_,
+                                std::move(host_zoom_dictionary));
   }
 
-  if (modification_is_removal)
-    host_zoom_dictionary->RemoveWithoutPathExpansion(change.host, nullptr);
-  else
-    host_zoom_dictionary->SetDoubleWithoutPathExpansion(change.host, level);
+  if (modification_is_removal) {
+    host_zoom_dictionary_weak->RemoveWithoutPathExpansion(change.host, nullptr);
+  } else {
+    host_zoom_dictionary_weak->SetDoubleWithoutPathExpansion(change.host,
+                                                             level);
+  }
 }
 
 // TODO(wjmaclean): Remove the dictionary_path once the migration code is