Update to Chromium revision 9cedf753 (#418732)

- Simplify usage of OnBeforePluginLoad (issue #2015)
- Switch crash reporting from crashpad to breakpad on Windows and OS X.
  Adds a new chrome_elf.dll dependency on Windows (issue #1995)
- Remove CefTextfield::GetPlaceholderTextColor() method which is no
  longer supported by Chromium.

libcef/browser/devtools_manager_delegate.h

@@ -0,0 +1,37 @@
+// Copyright 2013 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.
+
+#ifndef CEF_LIBCEF_BROWSER_DEVTOOLS_MANAGER_DELEGATE_H_
+#define CEF_LIBCEF_BROWSER_DEVTOOLS_MANAGER_DELEGATE_H_
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "content/public/browser/devtools_manager_delegate.h"
+
+namespace content {
+class BrowserContext;
+}
+
+class CefDevToolsManagerDelegate : public content::DevToolsManagerDelegate {
+ public:
+  static void StartHttpHandler(content::BrowserContext* browser_context);
+  static void StopHttpHandler();
+
+  CefDevToolsManagerDelegate();
+  ~CefDevToolsManagerDelegate() override;
+
+  // DevToolsManagerDelegate implementation.
+  void Inspect(content::DevToolsAgentHost* agent_host) override {}
+  void DevToolsAgentStateChanged(content::DevToolsAgentHost* agent_host,
+                                 bool attached) override {}
+  scoped_refptr<content::DevToolsAgentHost> CreateNewTarget(const GURL& url)
+      override;
+  std::string GetDiscoveryPageHTML() override;
+  std::string GetFrontendResource(const std::string& path) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CefDevToolsManagerDelegate);
+};
+
+#endif  // CEF_LIBCEF_BROWSER_DEVTOOLS_MANAGER_DELEGATE_H_