Componentize GCM Part 1: create GCM component and move some files over

components/gcm/system_encryptor.cc

Index: components/gcm/system_encryptor.cc
diff --git a/components/sync_driver/system_encryptor.cc b/components/gcm/system_encryptor.cc
similarity index 85%
copy from components/sync_driver/system_encryptor.cc
copy to components/gcm/system_encryptor.cc
index 53eaa962abdbf57da5ae81c9b132571886f45f96..9ca45692811005ad1dc936925b77890560ab540e 100644
--- a/components/sync_driver/system_encryptor.cc
+++ b/components/gcm/system_encryptor.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/sync_driver/system_encryptor.h"
+#include "components/gcm/system_encryptor.h"
 
 #include "components/os_crypt/os_crypt.h"
 
-namespace browser_sync {
+namespace gcm {
 
 SystemEncryptor::~SystemEncryptor() {}
 
@@ -20,4 +20,4 @@ bool SystemEncryptor::DecryptString(const std::string& ciphertext,
   return ::OSCrypt::DecryptString(ciphertext, plaintext);
 }
 
-}  // namespace browser_sync
+}  // namespace gcm