base: get rid of deprecated TrimWhitespace() function

chromeos/dbus/power_policy_controller.cc

Index: chromeos/dbus/power_policy_controller.cc
diff --git a/chromeos/dbus/power_policy_controller.cc b/chromeos/dbus/power_policy_controller.cc
index 336b72e95e351dd94c0287fcd541aa3dab0e9a73..49c76c280d94cabe5e9aa4ef3cf006c427283a5f 100644
--- a/chromeos/dbus/power_policy_controller.cc
+++ b/chromeos/dbus/power_policy_controller.cc
@@ -152,7 +152,7 @@ std::string PowerPolicyController::GetPolicyDebugString(
   }
   if (policy.has_reason())
     str += base::StringPrintf("reason=\"%s\" ", policy.reason().c_str());
-  base::TrimWhitespace(str, base::TRIM_TRAILING, &str);
+  base::TrimWhitespaceASCII(str, base::TRIM_TRAILING, &str);
   return str;
 }