Move some accessibility methods, enums and interfaces into the content/public API.

content/public/browser/render_widget_host.h

Index: content/public/browser/render_widget_host.h
diff --git a/content/public/browser/render_widget_host.h b/content/public/browser/render_widget_host.h
index 113477a4a2cf000f57e63292b1ccac7c476dea85..5d960575bda931cd2d7b2e5771778d18f8a64848 100644
--- a/content/public/browser/render_widget_host.h
+++ b/content/public/browser/render_widget_host.h
@@ -9,6 +9,7 @@
 #include "content/common/content_export.h"
 #include "content/public/browser/keyboard_listener.h"
 #include "content/public/browser/native_web_keyboard_event.h"
+#include "content/public/common/accessibility_mode.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_sender.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
@@ -200,8 +201,8 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Sender {
                                                CGContextRef target) = 0;
 #endif
 
-  // Send a command to the renderer to turn on full accessibility.
-  virtual void EnableFullAccessibilityMode() = 0;
+  virtual AccessibilityMode GetAccessibilityMode() const = 0;
+  virtual void SetAccessibilityMode(AccessibilityMode mode) = 0;
 
   // Forwards the given message to the renderer. These are called by
   // the view when it has received a message.