TabManager: Remove a redundant log line which produces excessive log.

chrome/browser/memory/tab_manager_delegate_chromeos.cc

Index: chrome/browser/memory/tab_manager_delegate_chromeos.cc
diff --git a/chrome/browser/memory/tab_manager_delegate_chromeos.cc b/chrome/browser/memory/tab_manager_delegate_chromeos.cc
index 872a88473d38f1687df611aca7d85cd01825e0c3..7a5663563889936a9b6cd7cee3948b9b464a630d 100644
--- a/chrome/browser/memory/tab_manager_delegate_chromeos.cc
+++ b/chrome/browser/memory/tab_manager_delegate_chromeos.cc
@@ -647,8 +647,6 @@ void TabManagerDelegate::LowMemoryKillImpl(
         MemoryKillsMonitor::LogLowMemoryKill("TAB", estimated_memory_freed_kb);
         MEMORY_LOG(ERROR) << "Killed " << *it << ", estimated "
                           << estimated_memory_freed_kb << " KB freed";
-      } else {
-        MEMORY_LOG(ERROR) << "Failed to kill " << *it;
       }
     }
   }