Remove unused DidPageReceiveSafeBrowsingMatch code.

chrome/browser/safe_browsing/safe_browsing_tab_observer.cc

Index: chrome/browser/safe_browsing/safe_browsing_tab_observer.cc
diff --git a/chrome/browser/safe_browsing/safe_browsing_tab_observer.cc b/chrome/browser/safe_browsing/safe_browsing_tab_observer.cc
index 00df92ed09b3964283186d4c6d0b0b2f268b3bbf..7fe047cb60128ad419deb4a88f96c942b116f48f 100644
--- a/chrome/browser/safe_browsing/safe_browsing_tab_observer.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_tab_observer.cc
@@ -81,13 +81,4 @@ void SafeBrowsingTabObserver::UpdateSafebrowsingDetectionHost() {
 #endif
 }
 
-bool SafeBrowsingTabObserver::DidPageReceiveSafeBrowsingMatch() const {
-#if defined(SAFE_BROWSING_CSD)
-  return safebrowsing_detection_host_ &&
-      safebrowsing_detection_host_->DidPageReceiveSafeBrowsingMatch();
-#else
-  return false;
-#endif
-}
-
 }  // namespace safe_browsing