Reland: 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..1be0bc75dd43da998dccc0a4859b75cc2d1dd92b 100644
--- a/chrome/browser/background/background_contents_service.cc
+++ b/chrome/browser/background/background_contents_service.cc
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_util.h"
@@ -763,10 +764,10 @@ 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(