Avoid DCHECK failures from get_characterExtents and get_unclippedSubstrings

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 fb4c32e7001f228af8bbbda74d27f6b12becbb04..801a2d7a965667c4db4c3958e0ab096012cb33c6 100644
--- a/content/browser/accessibility/browser_accessibility_win.cc
+++ b/content/browser/accessibility/browser_accessibility_win.cc
@@ -1932,6 +1932,9 @@ STDMETHODIMP BrowserAccessibilityWin::get_characterExtents(
   if (offset < 0 || offset > static_cast<LONG>(text_str.size()))
     return E_INVALIDARG;
 
+  if (role_ != blink::WebAXRoleStaticText)
+    return E_FAIL;
+
   gfx::Rect character_bounds;
   if (coordinate_type == IA2_COORDTYPE_SCREEN_RELATIVE) {
     character_bounds = GetGlobalBoundsForRange(offset, 1);
@@ -2717,6 +2720,9 @@ STDMETHODIMP BrowserAccessibilityWin::get_unclippedSubstringBounds(
     return E_INVALIDARG;
   }
 
+  if (role_ != blink::WebAXRoleStaticText)
+    return E_FAIL;
+
   gfx::Rect bounds = GetGlobalBoundsForRange(
       start_index, end_index - start_index);
   *out_x = bounds.x();