[Sync] Move ModelType and related classes to 'syncer' namespace

sync/api/sync_error.h

Index: sync/api/sync_error.h
diff --git a/sync/api/sync_error.h b/sync/api/sync_error.h
index 0e3a3c96d11f577ebfc996fbc543b4ca359fab00..657c17d4783dcb4e9f5695cbbefa53c6c26ed748 100644
--- a/sync/api/sync_error.h
+++ b/sync/api/sync_error.h
@@ -33,7 +33,7 @@ class SyncError {
   // Will print the new error to LOG(ERROR).
   SyncError(const tracked_objects::Location& location,
             const std::string& message,
-            syncable::ModelType type);
+            syncer::ModelType type);
 
   // Copy and assign via deep copy.
   SyncError(const SyncError& other);
@@ -46,7 +46,7 @@ class SyncError {
   // Will print the new error to LOG(ERROR).
   void Reset(const tracked_objects::Location& location,
              const std::string& message,
-             syncable::ModelType type);
+             syncer::ModelType type);
 
   // Whether this is a valid error or not.
   bool IsSet() const;
@@ -54,7 +54,7 @@ class SyncError {
   // These must only be called if IsSet() is true.
   const tracked_objects::Location& location() const;
   const std::string& message() const;
-  syncable::ModelType type() const;
+  syncer::ModelType type() const;
 
   // Returns empty string is IsSet() is false.
   std::string ToString() const;
@@ -70,7 +70,7 @@ class SyncError {
   // is called, IsSet() will return true.
   void Init(const tracked_objects::Location& location,
             const std::string& message,
-            syncable::ModelType type);
+            syncer::ModelType type);
 
   // Reset the error to it's default (unset) values.
   void Clear();
@@ -78,7 +78,7 @@ class SyncError {
   // scoped_ptr is necessary because Location objects aren't assignable.
   scoped_ptr<tracked_objects::Location> location_;
   std::string message_;
-  syncable::ModelType type_;
+  syncer::ModelType type_;
 };
 
 // gmock printer helper.