Remove dead code in SafeBrowsingDatabaseManager.

SafeBrowsingDatabaseManager::LogPauseDelay() has been dead code since http://crrev.com/169608
when it was moved to UIManager it looks like.

BUG=None

Review URL: https://codereview.chromium.org/725113003

Cr-Commit-Position: refs/heads/master@{#305107}

chrome/browser/safe_browsing/database_manager.cc

@@ -630,10 +630,6 @@ void SafeBrowsingDatabaseManager::ResetDatabase() {
       &SafeBrowsingDatabaseManager::OnResetDatabase, this));
 }
 
-void SafeBrowsingDatabaseManager::LogPauseDelay(base::TimeDelta time) {
-  UMA_HISTOGRAM_LONG_TIMES("SB2.Delay", time);
-}
-
 void SafeBrowsingDatabaseManager::StartOnIOThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (enabled_)

chrome/browser/safe_browsing/database_manager.h

@@ -188,12 +188,6 @@ class SafeBrowsingDatabaseManager
                             const std::vector<SBFullHashResult>& full_hashes,
                             const base::TimeDelta& cache_lifetime);
 
-  // Log the user perceived delay caused by SafeBrowsing. This delay is the time
-  // delta starting from when we would have started reading data from the
-  // network, and ending when the SafeBrowsing check completes indicating that
-  // the current page is 'safe'.
-  void LogPauseDelay(base::TimeDelta time);
-
   // Called to initialize objects that are used on the io_thread.  This may be
   // called multiple times during the life of the DatabaseManager. Should be
   // called on IO thread.