Various optimizations to reduce the number of temporary allocations.

chrome/browser/extensions/api/font_settings/font_settings_api.cc

Index: chrome/browser/extensions/api/font_settings/font_settings_api.cc
diff --git a/chrome/browser/extensions/api/font_settings/font_settings_api.cc b/chrome/browser/extensions/api/font_settings/font_settings_api.cc
index cf01a958e33df9ba0d82949357627cf7e80edca3..22d31b6b187538a517f0a6996b01ebd4e2883fd3 100644
--- a/chrome/browser/extensions/api/font_settings/font_settings_api.cc
+++ b/chrome/browser/extensions/api/font_settings/font_settings_api.cc
@@ -61,8 +61,8 @@ std::string GetFontNamePrefPath(fonts::GenericFamily generic_family_enum,
     script = prefs::kWebKitCommonScript;
   std::string generic_family = fonts::ToString(generic_family_enum);
   return base::StringPrintf(kWebKitFontPrefFormat,
-                            generic_family.c_str(),
-                            script.c_str());
+                            generic_family,
+                            script);
 }
 
 // Returns the localized name of a font so that it can be matched within the
@@ -86,8 +86,7 @@ void RegisterFontFamilyMapObserver(
     const PrefChangeRegistrar::NamedChangeCallback& callback) {
   for (size_t i = 0; i < prefs::kWebKitScriptsForFontFamilyMapsLength; ++i) {
     const char* script = prefs::kWebKitScriptsForFontFamilyMaps[i];
-    std::string pref_name = base::StringPrintf("%s.%s", map_name, script);
-    registrar->Add(pref_name.c_str(), callback);
+    registrar->Add(base::StringPrintf("%s.%s", map_name, script), callback);
   }
 }
 
@@ -156,7 +155,7 @@ void FontSettingsEventRouter::OnFontNamePrefChanged(
     const std::string& generic_family,
     const std::string& script) {
   const PrefService::Preference* pref = registrar_.prefs()->FindPreference(
-      pref_name.c_str());
+      pref_name);
   CHECK(pref);
 
   std::string font_name;
@@ -187,7 +186,7 @@ void FontSettingsEventRouter::OnFontPrefChanged(
     const std::string& key,
     const std::string& pref_name) {
   const PrefService::Preference* pref = registrar_.prefs()->FindPreference(
-      pref_name.c_str());
+      pref_name);
   CHECK(pref);
 
   base::ListValue args;
@@ -235,10 +234,10 @@ bool FontSettingsClearFontFunction::RunSync() {
 
   // Ensure |pref_path| really is for a registered per-script font pref.
   EXTENSION_FUNCTION_VALIDATE(
-      GetProfile()->GetPrefs()->FindPreference(pref_path.c_str()));
+      GetProfile()->GetPrefs()->FindPreference(pref_path));
 
   PreferenceAPI::Get(GetProfile())->RemoveExtensionControlledPref(
-      extension_id(), pref_path.c_str(), kExtensionPrefsScopeRegular);
+      extension_id(), pref_path, kExtensionPrefsScopeRegular);
   return true;
 }
 
@@ -252,7 +251,7 @@ bool FontSettingsGetFontFunction::RunSync() {
 
   PrefService* prefs = GetProfile()->GetPrefs();
   const PrefService::Preference* pref =
-      prefs->FindPreference(pref_path.c_str());
+      prefs->FindPreference(pref_path);
 
   std::string font_name;
   EXTENSION_FUNCTION_VALIDATE(
@@ -288,11 +287,11 @@ bool FontSettingsSetFontFunction::RunSync() {
 
   // Ensure |pref_path| really is for a registered font pref.
   EXTENSION_FUNCTION_VALIDATE(
-      GetProfile()->GetPrefs()->FindPreference(pref_path.c_str()));
+      GetProfile()->GetPrefs()->FindPreference(pref_path));
 
   PreferenceAPI::Get(GetProfile())->SetExtensionControlledPref(
       extension_id(),
-      pref_path.c_str(),
+      pref_path,
       kExtensionPrefsScopeRegular,
       new base::StringValue(params->details.font_id));
   return true;