Pass correct country iso code to PhoneNumberDetector

A typo in https://codereview.chromium.org/254823005 caused wrong
parameter is passed to PhoneNumberDetector, causing detection failure
of phone numbers without full country code.

BUG=418704

Review URL: https://codereview.chromium.org/638753002

Cr-Commit-Position: refs/heads/master@{#298628}
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index df9f413..5e68a868 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -724,7 +724,7 @@
   const std::string region_code =
       command_line.HasSwitch(switches::kNetworkCountryIso)
           ? command_line.GetSwitchValueASCII(switches::kNetworkCountryIso)
-          : net::android::GetTelephonyNetworkOperator();
+          : net::android::GetTelephonyNetworkCountryIso();
   content_detectors_.push_back(linked_ptr<ContentDetector>(
       new AddressDetector()));
   content_detectors_.push_back(linked_ptr<ContentDetector>(