De-templatize ui::AXPosition

content/browser/accessibility/browser_accessibility_manager.h

Index: content/browser/accessibility/browser_accessibility_manager.h
diff --git a/content/browser/accessibility/browser_accessibility_manager.h b/content/browser/accessibility/browser_accessibility_manager.h
index 3f1d7b54bd9b1d293d3e80b439c4d4e24c84256d..7d0fdb97b1314f3f47b2bb14cfba71b313604d79 100644
--- a/content/browser/accessibility/browser_accessibility_manager.h
+++ b/content/browser/accessibility/browser_accessibility_manager.h
@@ -209,8 +209,7 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
   void SetScrollOffset(const BrowserAccessibility& node, gfx::Point offset);
   void SetValue(
       const BrowserAccessibility& node, const base::string16& value);
-  void SetSelection(
-      ui::AXRange<AXPlatformPosition::AXPositionInstance::element_type> range);
+  void SetSelection(ui::AXAbstractRange range);
   void SetAccessibilityFocus(const BrowserAccessibility& node);
   void ShowContextMenu(const BrowserAccessibility& node);
 
@@ -392,7 +391,7 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
   void CacheHitTestResult(BrowserAccessibility* hit_test_result);
 
  protected:
-  using AXPlatformPositionInstance = AXPlatformPosition::AXPositionInstance;
+  using AXPlatformPositionInstance = AXPlatformPosition::ConcreteInstance;
   using AXPlatformRange = ui::AXRange<AXPlatformPositionInstance::element_type>;
 
   BrowserAccessibilityManager(