Revert of Added a system caret used for accessibility on Windows.

content/browser/renderer_host/legacy_render_widget_host_win.h

Index: content/browser/renderer_host/legacy_render_widget_host_win.h
diff --git a/content/browser/renderer_host/legacy_render_widget_host_win.h b/content/browser/renderer_host/legacy_render_widget_host_win.h
index b89060ed8022c6386e3fd3d9bafdc88bf2495a3e..91a02052432b235f8d5fe59cf65754cb08c81edd 100644
--- a/content/browser/renderer_host/legacy_render_widget_host_win.h
+++ b/content/browser/renderer_host/legacy_render_widget_host_win.h
@@ -24,7 +24,7 @@
 }  // namespace gfx
 
 namespace ui {
-class AXSystemCaretWin;
+class AXFakeCaretWin;
 class WindowEventTarget;
 }
 
@@ -121,7 +121,7 @@
     host_ = host;
   }
 
-  // Changes the position of the system caret used for accessibility.
+  // Changes the position of the fake caret.
   void MoveCaretTo(const gfx::Rect& bounds);
 
  protected:
@@ -164,7 +164,7 @@
   RenderWidgetHostViewAura* host_;
 
   // Some assistive software need to track the location of the caret.
-  std::unique_ptr<ui::AXSystemCaretWin> ax_system_caret_;
+  std::unique_ptr<ui::AXFakeCaretWin> ax_fake_caret_;
 
   // This class provides functionality to register the legacy window as a
   // Direct Manipulation consumer. This allows us to support smooth scroll