Revert of Move JoinString to the base namespace

content/browser/renderer_host/pepper/pepper_tcp_socket.cc

Index: content/browser/renderer_host/pepper/pepper_tcp_socket.cc
diff --git a/content/browser/renderer_host/pepper/pepper_tcp_socket.cc b/content/browser/renderer_host/pepper/pepper_tcp_socket.cc
index 16b19b23bb8dc2baba85b37697ffc8c7dabfc66a..8d590f77adb757f7399ef217db37aa6c1c5920f3 100644
--- a/content/browser/renderer_host/pepper/pepper_tcp_socket.cc
+++ b/content/browser/renderer_host/pepper/pepper_tcp_socket.cc
@@ -313,11 +313,10 @@
                    new base::StringValue(issuer.country_name));
   fields->SetField(
       PP_X509CERTIFICATE_PRIVATE_ISSUER_ORGANIZATION_NAME,
-      new base::StringValue(base::JoinString(issuer.organization_names, "\n")));
+      new base::StringValue(JoinString(issuer.organization_names, '\n')));
   fields->SetField(
       PP_X509CERTIFICATE_PRIVATE_ISSUER_ORGANIZATION_UNIT_NAME,
-      new base::StringValue(
-          base::JoinString(issuer.organization_unit_names, "\n")));
+      new base::StringValue(JoinString(issuer.organization_unit_names, '\n')));
 
   const net::CertPrincipal& subject = cert.subject();
   fields->SetField(PP_X509CERTIFICATE_PRIVATE_SUBJECT_COMMON_NAME,
@@ -330,12 +329,10 @@
                    new base::StringValue(subject.country_name));
   fields->SetField(
       PP_X509CERTIFICATE_PRIVATE_SUBJECT_ORGANIZATION_NAME,
-      new base::StringValue(
-          base::JoinString(subject.organization_names, "\n")));
+      new base::StringValue(JoinString(subject.organization_names, '\n')));
   fields->SetField(
       PP_X509CERTIFICATE_PRIVATE_SUBJECT_ORGANIZATION_UNIT_NAME,
-      new base::StringValue(
-          base::JoinString(subject.organization_unit_names, "\n")));
+      new base::StringValue(JoinString(subject.organization_unit_names, '\n')));
 
   const std::string& serial_number = cert.serial_number();
   fields->SetField(PP_X509CERTIFICATE_PRIVATE_SERIAL_NUMBER,