[Sync] Convert sync to a static library.

components/sync/api/model_type_store.h

Index: components/sync/api/model_type_store.h
diff --git a/components/sync/api/model_type_store.h b/components/sync/api/model_type_store.h
index 18377b359586ac0cb6c21e4833a309ee049e1b10..f3844a900cd1c62356d1a5680eba2dd46aea2da2 100644
--- a/components/sync/api/model_type_store.h
+++ b/components/sync/api/model_type_store.h
@@ -12,7 +12,6 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "components/sync/base/model_type.h"
-#include "components/sync/base/sync_export.h"
 
 namespace base {
 class SequencedTaskRunner;
@@ -46,7 +45,7 @@ namespace syncer_v2 {
 // Destroying store object doesn't necessarily cancel asynchronous operations
 // issued previously. You should be prepared to handle callbacks from those
 // operations.
-class SYNC_EXPORT ModelTypeStore {
+class ModelTypeStore {
  public:
   // Result of store operations.
   enum class Result {
@@ -64,7 +63,7 @@ class SYNC_EXPORT ModelTypeStore {
   };
 
   // WriteBatch object is used in all modification operations.
-  class SYNC_EXPORT WriteBatch {
+  class WriteBatch {
    public:
     virtual ~WriteBatch();