Switch AccessibilityMode to be a bitmap

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 9d3d6860e06ab66a7dfc21ae99cabf4648ae2e15..498f41d22d5e705e06ca56f2a18e98c4db149dd0 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -73,7 +73,7 @@
 
 #define IPC_MESSAGE_START ViewMsgStart
 
-IPC_ENUM_TRAITS(AccessibilityMode)
+IPC_ENUM_TRAITS(AccessibilityModeFlag)
 IPC_ENUM_TRAITS(ViewMsg_Navigate_Type::Value)
 IPC_ENUM_TRAITS(blink::WebContextMenuData::MediaType)
 IPC_ENUM_TRAITS(blink::WebMediaPlayerAction::Type)
@@ -743,7 +743,7 @@ IPC_STRUCT_BEGIN(ViewMsg_New_Params)
   IPC_STRUCT_MEMBER(blink::WebScreenInfo, screen_info)
 
   // The accessibility mode of the renderer.
-  IPC_STRUCT_MEMBER(AccessibilityMode, accessibility_mode)
+  IPC_STRUCT_MEMBER(unsigned int, accessibility_mode)
 
   // Specifies whether partially swapping composited buffers is
   // allowed for a renderer. Partial swaps will be used if they are both
@@ -1267,7 +1267,7 @@ IPC_MESSAGE_CONTROL1(ViewMsg_TempCrashWithData,
 
 // Change the accessibility mode in the renderer process.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetAccessibilityMode,
-                    AccessibilityMode)
+                    unsigned int /* accessibility_mode */)
 
 // An acknowledge to ViewHostMsg_MultipleTargetsTouched to notify the renderer
 // process to release the magnified image.