[Sync] Put everything in sync/api into csync namespace

chrome/browser/extensions/app_sync_data.h

Index: chrome/browser/extensions/app_sync_data.h
diff --git a/chrome/browser/extensions/app_sync_data.h b/chrome/browser/extensions/app_sync_data.h
index d6c390f201ded65025a7d03c0c2aaa249005b3a9..353acd567807fe8059b3b775b320a703456eeb4c 100644
--- a/chrome/browser/extensions/app_sync_data.h
+++ b/chrome/browser/extensions/app_sync_data.h
@@ -10,7 +10,10 @@
 #include "chrome/common/string_ordinal.h"
 #include "sync/api/sync_change.h"
 
+namespace csync {
 class SyncData;
+}
+
 namespace sync_pb {
 class AppSpecifics;
 }
@@ -24,8 +27,8 @@ class ExtensionSyncData;
 class AppSyncData {
  public:
   AppSyncData();
-  explicit AppSyncData(const SyncData& sync_data);
-  explicit AppSyncData(const SyncChange& sync_change);
+  explicit AppSyncData(const csync::SyncData& sync_data);
+  explicit AppSyncData(const csync::SyncChange& sync_change);
   AppSyncData(const Extension& extension,
               bool enabled,
               bool incognito_enabled,
@@ -36,8 +39,9 @@ class AppSyncData {
   ~AppSyncData();
 
   // Retrive sync data from this class.
-  SyncData GetSyncData() const;
-  SyncChange GetSyncChange(SyncChange::SyncChangeType change_type) const;
+  csync::SyncData GetSyncData() const;
+  csync::SyncChange GetSyncChange(
+      csync::SyncChange::SyncChangeType change_type) const;
 
   const std::string& id() const { return extension_sync_data_.id(); }
 
@@ -69,7 +73,7 @@ class AppSyncData {
   // Populate this class from sync inputs.
   void PopulateFromAppSpecifics(
       const sync_pb::AppSpecifics& specifics);
-  void PopulateFromSyncData(const SyncData& sync_data);
+  void PopulateFromSyncData(const csync::SyncData& sync_data);
 
   ExtensionSyncData extension_sync_data_;
   std::string notifications_client_id_;