Remove redundant c_str() calls.

chrome/browser/extensions/api/preference/preference_api.cc

Index: chrome/browser/extensions/api/preference/preference_api.cc
diff --git a/chrome/browser/extensions/api/preference/preference_api.cc b/chrome/browser/extensions/api/preference/preference_api.cc
index 25008a671babf7d876ca14d265462c6c9cc44272..8c1422bcc1062f79c4c007d93d00f1e0c32b2f49 100644
--- a/chrome/browser/extensions/api/preference/preference_api.cc
+++ b/chrome/browser/extensions/api/preference/preference_api.cc
@@ -383,7 +383,7 @@ void PreferenceEventRouter::OnPrefChanged(PrefService* pref_service,
 
   base::ListValue args;
   const PrefService::Preference* pref =
-      pref_service->FindPreference(browser_pref.c_str());
+      pref_service->FindPreference(browser_pref);
   CHECK(pref);
   PrefTransformerInterface* transformer =
       PrefMapping::GetInstance()->FindTransformerForBrowserPref(browser_pref);
@@ -427,7 +427,7 @@ void PreferenceAPIBase::SetExtensionControlledPref(
     base::Value* value) {
 #ifndef NDEBUG
   const PrefService::Preference* pref =
-      extension_prefs()->pref_service()->FindPreference(pref_key.c_str());
+      extension_prefs()->pref_service()->FindPreference(pref_key);
   DCHECK(pref) << "Extension controlled preference key " << pref_key
                << " not registered.";
   DCHECK_EQ(pref->GetType(), value->GetType())
@@ -455,7 +455,7 @@ void PreferenceAPIBase::RemoveExtensionControlledPref(
     const std::string& extension_id,
     const std::string& pref_key,
     ExtensionPrefsScope scope) {
-  DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key.c_str()))
+  DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key))
       << "Extension controlled preference key " << pref_key
       << " not registered.";
 
@@ -476,7 +476,7 @@ bool PreferenceAPIBase::CanExtensionControlPref(
      const std::string& extension_id,
      const std::string& pref_key,
      bool incognito) {
-  DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key.c_str()))
+  DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key))
       << "Extension controlled preference key " << pref_key
       << " not registered.";
 
@@ -488,7 +488,7 @@ bool PreferenceAPIBase::DoesExtensionControlPref(
     const std::string& extension_id,
     const std::string& pref_key,
     bool* from_incognito) {
-  DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key.c_str()))
+  DCHECK(extension_prefs()->pref_service()->FindPreference(pref_key))
       << "Extension controlled preference key " << pref_key
       << " not registered.";
 
@@ -619,7 +619,7 @@ ExtensionFunction::ResponseAction GetPreferenceFunction::Run() {
   PrefService* prefs =
       incognito ? profile->GetOffTheRecordPrefs() : profile->GetPrefs();
   const PrefService::Preference* pref =
-      prefs->FindPreference(browser_pref.c_str());
+      prefs->FindPreference(browser_pref);
   CHECK(pref);
 
   std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue);
@@ -707,7 +707,7 @@ ExtensionFunction::ResponseAction SetPreferenceFunction::Run() {
 
   ExtensionPrefs* prefs = ExtensionPrefs::Get(browser_context());
   const PrefService::Preference* pref =
-      prefs->pref_service()->FindPreference(browser_pref.c_str());
+      prefs->pref_service()->FindPreference(browser_pref);
   CHECK(pref);
 
   // Validate new value.