base: Remove the string logging from CHECK().

ash/common/system/tray/system_tray.cc

Index: ash/common/system/tray/system_tray.cc
diff --git a/ash/common/system/tray/system_tray.cc b/ash/common/system/tray/system_tray.cc
index bf77079841f884a8a62c18b7cdb6fb077657de4d..a4836329fde9524d35942f5dbc20324c1af1208a 100644
--- a/ash/common/system/tray/system_tray.cc
+++ b/ash/common/system/tray/system_tray.cc
@@ -838,7 +838,8 @@ void SystemTray::ActivateAndStartNavigation(const ui::KeyEvent& key_event) {
   activating_ = false;
   // TODO(oshima): This is to troubleshoot the issue crbug.com/651242. Remove
   // once the root cause is fixed.
-  CHECK(system_bubble_) << " the bubble was deleted while activaing it";
+  //  the bubble was deleted while activaing it
+  CHECK(system_bubble_);
 
   views::Widget* widget = GetSystemBubble()->bubble_view()->GetWidget();
   widget->GetFocusManager()->OnKeyEvent(key_event);