Remove ash::ShellDelegate::IsFirstRunAfterBoot method

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 44fc929e64a6f43db4432584bcecf624f92319d7..f3d74afd7311e74c02bbf4e7dae822002328eba7 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -201,10 +201,6 @@ ShellDelegateImpl::~ShellDelegateImpl() {}
   return nullptr;
 }
 
-bool ShellDelegateImpl::IsFirstRunAfterBoot() const {
-  return false;
-}
-
 bool ShellDelegateImpl::IsIncognitoAllowed() const {
   return true;
 }