Stop passing raw pointers to base::Value API in c/b/chromeos and c/b/extensions

chrome/browser/background/background_contents_service.cc

Index: chrome/browser/background/background_contents_service.cc
diff --git a/chrome/browser/background/background_contents_service.cc b/chrome/browser/background/background_contents_service.cc
index ae384a895717fb16c3ce55ef883fb18400d4c149..a828dfe80c63f95c5b4d45940a435b02fbeed9ca 100644
--- a/chrome/browser/background/background_contents_service.cc
+++ b/chrome/browser/background/background_contents_service.cc
@@ -763,10 +763,10 @@ void BackgroundContentsService::RegisterBackgroundContents(
   }
 
   // No entry for this application yet, so add one.
-  base::DictionaryValue* dict = new base::DictionaryValue();
+  auto dict = base::MakeUnique<base::DictionaryValue>();
   dict->SetString(kUrlKey, background_contents->GetURL().spec());
   dict->SetString(kFrameNameKey, contents_map_[appid].frame_name);
-  pref->SetWithoutPathExpansion(base::UTF16ToUTF8(appid), dict);
+  pref->SetWithoutPathExpansion(base::UTF16ToUTF8(appid), std::move(dict));
 }
 
 bool BackgroundContentsService::HasRegisteredBackgroundContents(