sync: Improve StatusChangeChecker debug strings

chrome/browser/sync/test/integration/profile_sync_service_harness.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_SYNC_TEST_INTEGRATION_PROFILE_SYNC_SERVICE_HARNESS_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_PROFILE_SYNC_SERVICE_HARNESS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 164 matching lines @@
   // they're in).
   size_t GetNumDatatypes() const;
 
   // Gets the |auto_start_enabled_| variable from the |service_|.
   bool AutoStartEnabled();
 
   // Runs the UI message loop and waits until the Run() method of |checker|
   // returns true, indicating that the status change we are waiting for has
   // taken place. Caller retains ownership of |checker|, which must outlive this
   // method. Returns true if the status change was observed. In case of a
-  // timeout, we log the |source| of the call to this method, and return false.
-  bool AwaitStatusChange(StatusChangeChecker* checker,
-                         const std::string& source);
+  // timeout, we CHECK(false).
+  bool AwaitStatusChange(StatusChangeChecker* checker);
 
   // Returns a string that can be used as the value of an oauth2 refresh token.
   // This function guarantees that a different string is returned each time
   // it is called.
   std::string GenerateFakeOAuth2RefreshTokenString();
 
   // Returns a string with relevant info about client's sync state (if
   // available), annotated with |message|. Useful for logging.
   std::string GetClientInfoString(const std::string& message) const;
 
@@ skipping 52 matching lines @@
   const std::string profile_debug_name_;
 
   // Keeps track of the state change on which we are waiting. PSSHarness can
   // wait on only one status change at a time.
   StatusChangeChecker* status_change_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncServiceHarness);
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_PROFILE_SYNC_SERVICE_HARNESS_H_