DCHECK for a valid error callback callback in GetIsPinnedToTaskbarState

chrome/browser/ui/webui/welcome_win10_handler.cc

Index: chrome/browser/ui/webui/welcome_win10_handler.cc
diff --git a/chrome/browser/ui/webui/welcome_win10_handler.cc b/chrome/browser/ui/webui/welcome_win10_handler.cc
index 8ae1281acb5171df8bad48ced2235142d840c10a..57d8e12124ef19bc66cc1ac1fb2385db1c358cf4 100644
--- a/chrome/browser/ui/webui/welcome_win10_handler.cc
+++ b/chrome/browser/ui/webui/welcome_win10_handler.cc
@@ -64,8 +64,11 @@ WelcomeWin10Handler::~WelcomeWin10Handler() {
       ->StartCheckIsDefault();
 
   if (pin_instructions_shown) {
+    // On error, call RecordPinnedResult() with |succeeded| == false.
+    base::Closure error_callback =
+        base::Bind(&RecordPinnedResult, histogram_suffix, false, false);
     shell_integration::win::GetIsPinnedToTaskbarState(
-        base::Closure(), base::Bind(&RecordPinnedResult, histogram_suffix));
+        error_callback, base::Bind(&RecordPinnedResult, histogram_suffix));
   }
 }