Revert of sync: Add NonBlockingSyncTypeProcessorCore (https://codereview.chromium.org/192953008/)

Reason for revert:
Best guess that this broke
SyncFileSystemApiTest.WriteFileThenGetUsage
SyncFileSystemApiTest.GetFileStatuses
MediaGalleriesPlatformAppBrowserTest.MediaGalleriesCopyTo
on XP Tests(1).

Original issue's description:
> sync: Add NonBlockingSyncTypeProcessorCore
> 
> Adds the class for handling sync updates and commits on the sync thread.
> The current implementation is mostly a bunch of stubs.
> 
> In the future, this will be hooked up to a NonBlockingSyncTypeProcessor
> that lives on the model type's thread.  These two classes will
> collaborate to implement the non-blocking sync system.
> 
> This CL also adds some code to the ModelTypeRegistry and
> SyncSessionContext to prepare for managing these
> NonBlockingSyncTypeProcessor objects.  This new code is used only in
> tests.
> 
> BUG=351005
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=258035

TBR=zea@chromium.org,rlarocque@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=351005

Review URL: https://codereview.chromium.org/204913004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@258266 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 1 insertions, 2 deletions

diff --git a/sync/engine/commit_contributor.h b/sync/engine/commit_contributor.h
index 5e9d156..2d190af 100644
--- a/sync/engine/commit_contributor.h
+++ b/sync/engine/commit_contributor.h
@@ -8,7 +8,6 @@
 #include <cstddef>
 
 #include "base/memory/scoped_ptr.h"
-#include "sync/base/sync_export.h"
 
 namespace syncer {
 
@@ -22,7 +21,7 @@ class Directory;
 //
 // When asked, it can return CommitContribution objects that contain a set of
 // items to be committed from this source.
-class SYNC_EXPORT_PRIVATE CommitContributor {
+class CommitContributor {
  public:
   CommitContributor();
   virtual ~CommitContributor() = 0;