Use base::StartWith() in more places when appropriate.

google_apis/gcm/engine/gservices_settings.cc

Index: google_apis/gcm/engine/gservices_settings.cc
diff --git a/google_apis/gcm/engine/gservices_settings.cc b/google_apis/gcm/engine/gservices_settings.cc
index cde4d7fbb2ba56aaea7a19ccf70dd56534b91b96..65f4453f2082ace3bac98a0d231fcf6698f7fa02 100644
--- a/google_apis/gcm/engine/gservices_settings.cc
+++ b/google_apis/gcm/engine/gservices_settings.cc
@@ -227,7 +227,8 @@ bool GServicesSettings::UpdateFromCheckinResponse(
       return false;
     }
 
-    if (settings_diff && name.find(kDeleteSettingPrefix) == 0) {
+    if (settings_diff && base::StartsWith(name, kDeleteSettingPrefix,
+                                          base::CompareCase::SENSITIVE)) {
       std::string setting_to_delete =
           name.substr(arraysize(kDeleteSettingPrefix) - 1);
       new_settings.erase(setting_to_delete);