Make almost all public functions in XKeyboard pure virtual

chrome/browser/chromeos/system_key_event_listener.cc

Index: chrome/browser/chromeos/system_key_event_listener.cc
diff --git a/chrome/browser/chromeos/system_key_event_listener.cc b/chrome/browser/chromeos/system_key_event_listener.cc
index 6740eafb5f2e9bb1feda7c279dae6ac7720d4b37..09d5a7bc28a37ae9039e3e1006871400e2cbea82 100644
--- a/chrome/browser/chromeos/system_key_event_listener.cc
+++ b/chrome/browser/chromeos/system_key_event_listener.cc
@@ -76,10 +76,12 @@ SystemKeyEventListener* SystemKeyEventListener::GetInstance() {
 
 SystemKeyEventListener::SystemKeyEventListener()
     : stopped_(false),
-      num_lock_mask_(input_method::XKeyboard::GetNumLockMask()),
+      num_lock_mask_(0),
       xkb_event_base_(0) {
-  input_method::XKeyboard::GetLockedModifiers(
-      num_lock_mask_, &caps_lock_is_on_, &num_lock_is_on_);
+  input_method::XKeyboard* xkeyboard =
+      input_method::InputMethodManager::GetInstance()->GetXKeyboard();
+  num_lock_mask_ = xkeyboard->GetNumLockMask();
+  xkeyboard->GetLockedModifiers(&caps_lock_is_on_, &num_lock_is_on_);
 
   Display* display = ui::GetXDisplay();
   key_brightness_down_ = XKeysymToKeycode(display,