Reland of place string::find(prefix) == 0 pattern with base::StartsWith().

chromeos/settings/timezone_settings.cc

Index: chromeos/settings/timezone_settings.cc
diff --git a/chromeos/settings/timezone_settings.cc b/chromeos/settings/timezone_settings.cc
index b8ce973c92d8e234f5b5e3614f7eff387e2131d6..dcc9eda406cb2c77d49f61349ea73e3bcd51d8a8 100644
--- a/chromeos/settings/timezone_settings.cc
+++ b/chromeos/settings/timezone_settings.cc
@@ -223,7 +223,8 @@
 
   std::string timezone(buf, len);
   // Remove kTimezoneFilesDir from the beginning.
-  if (timezone.find(kTimezoneFilesDir) != 0) {
+  if (!base::StartsWith(timezone, kTimezoneFilesDir,
+                        base::CompareCase::SENSITIVE)) {
     LOG(ERROR) << "GetTimezoneID: Timezone symlink is wrong "
                << timezone;
     return std::string();