[Sync] Rename csync namespace to syncer

sync/engine/nigori_util.h

Index: sync/engine/nigori_util.h
diff --git a/sync/engine/nigori_util.h b/sync/engine/nigori_util.h
index 5e5c20ad43dfc2c34465fd26c0f2799048edc3c2..9d3e2de56adddac9851e3b5fa1c385c9bd34662a 100644
--- a/sync/engine/nigori_util.h
+++ b/sync/engine/nigori_util.h
@@ -12,7 +12,7 @@
 #include "sync/internal_api/public/syncable/model_type.h"
 #include "sync/protocol/nigori_specifics.pb.h"
 
-namespace csync {
+namespace syncer {
 class Cryptographer;
 }
 
@@ -43,7 +43,7 @@ bool VerifyUnsyncedChangesAreEncrypted(
 // or unencrypted, based on |encrypted_types|.
 bool ProcessUnsyncedChangesForEncryption(
     WriteTransaction* const trans,
-    csync::Cryptographer* cryptographer);
+    syncer::Cryptographer* cryptographer);
 
 // Returns true if the entry requires encryption but is not encrypted, false
 // otherwise. Note: this does not check that already encrypted entries are
@@ -58,7 +58,7 @@ bool SpecificsNeedsEncryption(ModelTypeSet encrypted_types,
 // Verifies all data of type |type| is encrypted appropriately.
 bool VerifyDataTypeEncryptionForTest(
     BaseTransaction* const trans,
-    csync::Cryptographer* cryptographer,
+    syncer::Cryptographer* cryptographer,
     ModelType type,
     bool is_encrypted) WARN_UNUSED_RESULT;
 
@@ -66,7 +66,7 @@ bool VerifyDataTypeEncryptionForTest(
 // Returns false if an error encrypting occurred (does not modify |entry|).
 // Note: gracefully handles new_specifics aliasing with entry->Get(SPECIFICS).
 bool UpdateEntryWithEncryption(
-    csync::Cryptographer* cryptographer,
+    syncer::Cryptographer* cryptographer,
     const sync_pb::EntitySpecifics& new_specifics,
     MutableEntry* entry);