make new syncer thread the default.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 3d508081238d3d584664037a643bd460f3ea95c8..f90aaafa89a00bf6d125be466631e926e5677984 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -901,9 +901,6 @@ const char kSyncServiceURL[]                = "sync-url";
 // Try to connect to XMPP using SSLTCP first (for testing).
 const char kSyncTrySsltcpFirstForXmpp[]     = "sync-try-ssltcp-first-for-xmpp";
 
-// Use new experimental SyncerThread implementation and friends.
-const char kNewSyncerThread[]               = "new-syncer-thread";
-
 // Pass the name of the current running automated test to Chrome.
 const char kTestName[]                      = "test-name";