assistant: Replace hard-coded device type string in OOBE.

Bug: 988177
Test: manually verified the message shown on Assistant OOBE ready sreen.
Change-Id: I18be0fc6d09697c0076ef45d4e283c234ea12e16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733846Reviewed-by: Yue Li <updowndota@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684109}

chrome/app/chromeos_strings.grdp

@@ -3258,7 +3258,7 @@
     Your Assistant is ready
   </message>
   <message name="IDS_ASSISTANT_READY_SCREEN_MESSAGE" desc="Message for Assistant ready screen.">
-    When your Chromebook is set up, press the Assistant button or say "Ok Google" to get help anytime. Go to Assistant settings to make changes.
+    When your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> is set up, press the Assistant button or say "Ok Google" to get help anytime. Go to Assistant settings to make changes.
   </message>
   <message name="IDS_ASSISTANT_CONTINUE_BUTTON" desc="Continue button for asssitant optin flow.">
     Continue

chrome/browser/ui/webui/chromeos/login/assistant_optin_flow_screen_handler.cc

@@ -26,6 +26,7 @@
 #include "components/prefs/pref_service.h"
 #include "components/user_manager/user_manager.h"
 #include "services/service_manager/public/cpp/connector.h"
+#include "ui/chromeos/devicetype_utils.h"
 
 namespace chromeos {
 
@@ -113,7 +114,8 @@ void AssistantOptInFlowScreenHandler::DeclareLocalizedValues(
   builder->Add("assistantOptinSaveButton", IDS_ASSISTANT_SAVE_BUTTON);
   builder->Add("assistantOptinWaitMessage", IDS_ASSISTANT_WAIT_MESSAGE);
   builder->Add("assistantReadyTitle", IDS_ASSISTANT_READY_SCREEN_TITLE);
-  builder->Add("assistantReadyMessage", IDS_ASSISTANT_READY_SCREEN_MESSAGE);
+  builder->AddF("assistantReadyMessage", IDS_ASSISTANT_READY_SCREEN_MESSAGE,
+                ui::GetChromeOSDeviceName());
   builder->Add("assistantReadyButton", IDS_ASSISTANT_DONE_BUTTON);
   builder->Add("back", IDS_EULA_BACK_BUTTON);
   builder->Add("next", IDS_EULA_NEXT_BUTTON);