Forward BrowserAccessibilityWin::get_accHelp to the platform node.

content/browser/accessibility/browser_accessibility_win.cc

Index: content/browser/accessibility/browser_accessibility_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_win.cc b/content/browser/accessibility/browser_accessibility_win.cc
index 162f191772fc133384ef8cfaf581aaa7d4b27aa1..da45802999888a73b3697702cd774605028bbd90 100644
--- a/content/browser/accessibility/browser_accessibility_win.cc
+++ b/content/browser/accessibility/browser_accessibility_win.cc
@@ -628,10 +628,7 @@ STDMETHODIMP BrowserAccessibilityWin::get_accHelp(VARIANT var_id, BSTR* help) {
   if (!instance_active())
     return E_FAIL;
 
-  if (!help)
-    return E_INVALIDARG;
-
-  return S_FALSE;
+  return GetPlatformNodeWin()->get_accHelp(var_id, help);
 }
 
 STDMETHODIMP BrowserAccessibilityWin::get_accKeyboardShortcut(VARIANT var_id,