Sync: Turn on full history sync by default.

chrome/browser/history/web_history_service_factory.cc

Index: chrome/browser/history/web_history_service_factory.cc
diff --git a/chrome/browser/history/web_history_service_factory.cc b/chrome/browser/history/web_history_service_factory.cc
index af51d1a74e7d80118dc5478075a55dd5f00e27cc..66a3b33a040730f69292900b461d1e441df2bfcf 100644
--- a/chrome/browser/history/web_history_service_factory.cc
+++ b/chrome/browser/history/web_history_service_factory.cc
@@ -17,8 +17,8 @@ namespace {
 // Returns true if the user is signed in and full history sync is enabled,
 // and false otherwise.
 bool IsHistorySyncEnabled(Profile* profile) {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kHistoryEnableFullHistorySync)) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kHistoryDisableFullHistorySync)) {
     ProfileSyncService* sync =
         ProfileSyncServiceFactory::GetInstance()->GetForProfile(profile);
     return sync &&