Continue to clean c_str() calls.

chrome/browser/ui/browser_window_state.cc

Index: chrome/browser/ui/browser_window_state.cc
diff --git a/chrome/browser/ui/browser_window_state.cc b/chrome/browser/ui/browser_window_state.cc
index db4308be132bb389c0a47bf9da7a0dbb5b9c83f3..e7eb1923632561cf30d5d02fa0bad2b09843e7b8 100644
--- a/chrome/browser/ui/browser_window_state.cc
+++ b/chrome/browser/ui/browser_window_state.cc
@@ -85,8 +85,8 @@ std::unique_ptr<DictionaryPrefUpdate> GetWindowPlacementDictionaryReadWrite(
     PrefService* prefs) {
   DCHECK(!window_name.empty());
   // A normal DictionaryPrefUpdate will suffice for non-app windows.
-  if (prefs->FindPreference(window_name.c_str())) {
-    return base::MakeUnique<DictionaryPrefUpdate>(prefs, window_name.c_str());
+  if (prefs->FindPreference(window_name)) {
+    return base::MakeUnique<DictionaryPrefUpdate>(prefs, window_name);
   }
   return std::unique_ptr<DictionaryPrefUpdate>(
       new WindowPlacementPrefUpdate(prefs, window_name));
@@ -96,8 +96,8 @@ const base::DictionaryValue* GetWindowPlacementDictionaryReadOnly(
     const std::string& window_name,
     PrefService* prefs) {
   DCHECK(!window_name.empty());
-  if (prefs->FindPreference(window_name.c_str()))
-    return prefs->GetDictionary(window_name.c_str());
+  if (prefs->FindPreference(window_name))
+    return prefs->GetDictionary(window_name);
 
   const base::DictionaryValue* app_windows =
       prefs->GetDictionary(prefs::kAppWindowPlacement);