make new syncer thread the default.

chrome/browser/sync/engine/syncapi.h

Index: chrome/browser/sync/engine/syncapi.h
diff --git a/chrome/browser/sync/engine/syncapi.h b/chrome/browser/sync/engine/syncapi.h
index 1718c715edf09a31bf40701c608d4fb354f715a0..1011a299d6ca4d9697cf1f728e0231336fc41106 100644
--- a/chrome/browser/sync/engine/syncapi.h
+++ b/chrome/browser/sync/engine/syncapi.h
@@ -808,12 +808,6 @@ class SyncManager {
     // message, unless otherwise specified, produces undefined behavior.
     virtual void OnInitializationComplete() = 0;
 
-    // The syncer thread has been paused.
-    virtual void OnPaused() = 0;
-
-    // The syncer thread has been resumed.
-    virtual void OnResumed() = 0;
-
     // We are no longer permitted to communicate with the server. Sync should
     // be disabled and state cleaned up at once.  This can happen for a number
     // of reasons, e.g. swapping from a test instance to production, or a
@@ -917,20 +911,6 @@ class SyncManager {
   // types, as we do not currently support decrypting datatypes.
   void EncryptDataTypes(const syncable::ModelTypeSet& encrypted_types);
 
-  // Requests the syncer thread to pause.  The observer's OnPause
-  // method will be called when the syncer thread is paused.  Returns
-  // false if the syncer thread can not be paused (e.g. if it is not
-  // started).
-  // TODO(tim): Deprecated.
-  bool RequestPause();
-
-  // Requests the syncer thread to resume.  The observer's OnResume
-  // method will be called when the syncer thread is resumed.  Returns
-  // false if the syncer thread can not be resumed (e.g. if it is not
-  // paused).
-  // TODO(tim): Deprecated.
-  bool RequestResume();
-
   // Puts the SyncerThread into a mode where no normal nudge or poll traffic
   // will occur, but calls to RequestConfig will be supported.  If |callback|
   // is provided, it will be invoked (from the internal SyncerThread) when