Remove IPC_BEGIN_MESSAGE_MAP_EX macro since r270839 made all bad IPCs kill their child processes.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
===================================================================
--- content/renderer/render_view_impl.cc	(revision 271040)
+++ content/renderer/render_view_impl.cc	(working copy)
@@ -1055,8 +1055,7 @@
       return true;
 
   bool handled = true;
-  bool msg_is_ok = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(RenderViewImpl, message, msg_is_ok)
+  IPC_BEGIN_MESSAGE_MAP(RenderViewImpl, message)
     IPC_MESSAGE_HANDLER(InputMsg_ExecuteEditCommand, OnExecuteEditCommand)
     IPC_MESSAGE_HANDLER(InputMsg_MoveCaret, OnMoveCaret)
     IPC_MESSAGE_HANDLER(InputMsg_ScrollFocusedEditableNodeIntoRect,
@@ -1149,12 +1148,6 @@
     IPC_MESSAGE_UNHANDLED(handled = RenderWidget::OnMessageReceived(message))
   IPC_END_MESSAGE_MAP()
 
-  if (!msg_is_ok) {
-    // The message had a handler, but its deserialization failed.
-    // Kill the renderer to avoid potential spoofing attacks.
-    CHECK(false) << "Unable to deserialize message in RenderViewImpl.";
-  }
-
   return handled;
 }