Revert of [DevTools] Extract platform module.

Source/devtools/front_end/host/ToolboxHost.js

Index: Source/devtools/front_end/host/ToolboxHost.js
diff --git a/Source/devtools/front_end/host/ToolboxHost.js b/Source/devtools/front_end/host/ToolboxHost.js
new file mode 100644
index 0000000000000000000000000000000000000000..75e973fd3fc0843e7900d81e605abbba7760992d
--- /dev/null
+++ b/Source/devtools/front_end/host/ToolboxHost.js
@@ -0,0 +1,15 @@
+// Copyright 2014 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.
+
+/**
+ * @interface
+ */
+WebInspector.ToolboxHost = function() {}
+
+WebInspector.ToolboxHost.prototype = {
+    /**
+     * @param {!Document} document
+     */
+    toolboxLoaded: function(document) {}
+}