Removes ShellPort::IsRunningInMash()

ash/aura/shell_port_classic.cc

Index: ash/aura/shell_port_classic.cc
diff --git a/ash/aura/shell_port_classic.cc b/ash/aura/shell_port_classic.cc
index 5da492de9b01f7f098c852c4d4b6c1afb37df910..9d87e869ec42fc806c881927be458698d84534f7 100644
--- a/ash/aura/shell_port_classic.cc
+++ b/ash/aura/shell_port_classic.cc
@@ -54,7 +54,7 @@ ShellPortClassic::~ShellPortClassic() {}
 
 // static
 ShellPortClassic* ShellPortClassic::Get() {
-  CHECK(!ShellPort::Get()->IsRunningInMash());
+  CHECK(Shell::GetAshConfig() == Config::CLASSIC);
   return static_cast<ShellPortClassic*>(ShellPort::Get());
 }
 
@@ -69,10 +69,6 @@ void ShellPortClassic::Shutdown() {
   Shell::Get()->window_tree_host_manager()->Shutdown();
 }
 
-bool ShellPortClassic::IsRunningInMash() const {
-  return false;
-}
-
 Config ShellPortClassic::GetAshConfig() const {
   return Config::CLASSIC;
 }