Convert ChromeViewMsg_SetAllowRunningInsecureContent to use mojo.

chrome/common/insecure_content_renderer.mojom

Index: chrome/common/insecure_content_renderer.mojom
diff --git a/chrome/common/insecure_content_renderer.mojom b/chrome/common/insecure_content_renderer.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..6f1efee17deb6b71c60671c060137cdf275f0b1e
--- /dev/null
+++ b/chrome/common/insecure_content_renderer.mojom
@@ -0,0 +1,12 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module chrome.mojom;
+
+// Renderers of possibly insecure mixed-content.
+interface InsecureContentRenderer {
+  // Sent to allow the running of insecure mixed-content. If received by the
+  // main frame, it will also reload the frame afterwards.
+  SetAllowRunningInsecureContent();
+};