First part of PAGE_TRANSITION_START_PAGE cleanup.

sync/protocol/sync_enums.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Sync protocol for communication between sync client and server.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 25 matching lines @@
   }
 
   // Types of transitions between pages.
   enum PageTransition {
     LINK = 0;
     TYPED = 1;
     AUTO_BOOKMARK = 2;
     AUTO_SUBFRAME = 3;
     MANUAL_SUBFRAME = 4;
     GENERATED = 5;
-    START_PAGE = 6;
+    AUTO_TOPLEVEL = 6;
     FORM_SUBMIT = 7;
     RELOAD = 8;
     KEYWORD = 9;
     KEYWORD_GENERATED = 10;
     CHAIN_START = 12;
     CHAIN_END = 13;
   }
 
   // These qualifiers further define the transition.
   enum PageTransitionQualifier {
@@ skipping 33 matching lines @@
     CLEAR_USER_DATA_AND_RESYNC  = 1; // Clear user data from dashboard and
                                      // setup sync again.
     ENABLE_SYNC_ON_ACCOUNT      = 2; // The administrator needs to enable sync
                                      // on the account.
     STOP_AND_RESTART_SYNC       = 3; // Stop sync and set up sync again.
     DISABLE_SYNC_ON_CLIENT      = 4; // Wipe the client of all sync data and
                                      // stop syncing.
     UNKNOWN_ACTION              = 5; // This is the default.
   }
 }