Use rewriting to make ChromeOS keyboard F<number> keys produce extended keycodes.

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.cc b/chrome/browser/ui/ash/chrome_shell_delegate.cc
index 6c555a6fa53750688036a9901547a151ba08aadb..eddf03c29df57a8550f6fda367b1e13e5b162e7e 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.cc
@@ -539,6 +539,11 @@ bool ChromeShellDelegate::IsSearchKeyActingAsFunctionKey() const {
   if (!chromebook_function_key)
     return false;
 
+  bool chromeos_keyboard = CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kHasChromeOSKeyboard);
+  if (!chromeos_keyboard)
+    return false;
+
   Profile* profile = ProfileManager::GetDefaultProfile();
   return profile->GetPrefs()->GetBoolean(
       prefs::kLanguageSearchKeyActsAsFunctionKey);