[Sync] Convert sync to a static library.

components/sync/engine_impl/commit_processor.h

Index: components/sync/engine_impl/commit_processor.h
diff --git a/components/sync/engine_impl/commit_processor.h b/components/sync/engine_impl/commit_processor.h
index ce6ddd2b14321ec2aa847f67031ef425aa3198f0..af1b70bf6d8e1e9317d12cd4d276262cd2ebfd8e 100644
--- a/components/sync/engine_impl/commit_processor.h
+++ b/components/sync/engine_impl/commit_processor.h
@@ -12,7 +12,6 @@
 
 #include "base/macros.h"
 #include "components/sync/base/model_type.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/engine/model_safe_worker.h"
 #include "components/sync/engine_impl/commit.h"
 #include "components/sync/sessions_impl/model_type_registry.h"
@@ -32,7 +31,7 @@ class CommitContribution;
 // Many methods allow the caller to specify a subset of types on which the
 // operation is to be applied.  It is a logic error if the supplied set of types
 // contains a type which was not previously registered.
-class SYNC_EXPORT CommitProcessor {
+class CommitProcessor {
  public:
   // Contructs a CommitProcessor from a map of CommitContributors.
   // The CommitProcessor does not own this map.