Revert of Signal extension API schema corruption to the browser process.

extensions/browser/extension_message_filter.cc

Index: extensions/browser/extension_message_filter.cc
diff --git a/extensions/browser/extension_message_filter.cc b/extensions/browser/extension_message_filter.cc
index 608d425d2045e78990e517383c54f3ce9411b2cb..6bdfac024e5f755f20880373371f1b489ddc93e1 100644
--- a/extensions/browser/extension_message_filter.cc
+++ b/extensions/browser/extension_message_filter.cc
@@ -18,7 +18,6 @@
 #include "extensions/browser/process_manager_factory.h"
 #include "extensions/browser/process_map.h"
 #include "extensions/common/extension.h"
-#include "extensions/common/extension_api.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/manifest_handlers/background_info.h"
 #include "ipc/ipc_message_macros.h"
@@ -135,8 +134,6 @@
                         OnExtensionTransferBlobsAck)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_WakeEventPage,
                         OnExtensionWakeEventPage)
-    IPC_MESSAGE_HANDLER(ExtensionHostMsg_NotifyBadExtensionApiSchema,
-                        OnExtensionNotifyBadExtensionApiSchema)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -321,26 +318,4 @@
   Send(new ExtensionMsg_WakeEventPageResponse(request_id, success));
 }
 
-void ExtensionMessageFilter::OnExtensionNotifyBadExtensionApiSchema(
-    const std::string& full_name) {
-  ExtensionAPI* extension_api = ExtensionAPI::GetSharedInstance();
-
-  // Try to resolve the full name; if we can't then the renderer sent a
-  // bogus name.
-  std::string api_name =
-      extension_api->GetAPINameFromFullName(full_name, nullptr);
-  if (api_name.empty()) {
-    ShutdownForBadMessage();
-    return;
-  }
-
-  // Since the renderer indicated that the schema for |api_name| was
-  // bad, we expect getting the schema to fail, and crash the browser.
-  CHECK(extension_api->GetSchema(api_name));
-
-  // If we reach here then the schema looked valid, indicating that
-  // the renderer must be at fault, so kill it.
-  ShutdownForBadMessage();
-}
-
 }  // namespace extensions