Simplify devtools code on android and enable devtools for android content_shell.

content/public/android/java/src/org/chromium/content/browser/RemoteDebuggingController.java

-// Copyright (c) 2012 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.
-
-package org.chromium.content.browser;
-
-import org.chromium.base.JNINamespace;
-
-// Controls DevTools remote debugging server state.
-@JNINamespace("content")
-public class RemoteDebuggingController {
-
-    private static RemoteDebuggingController sInstance;
-
-    private boolean mUserPreferenceEnabled;
-
-    public static RemoteDebuggingController getInstance() {
-        if (sInstance == null) {
-            sInstance = new RemoteDebuggingController();
-        }
-        return sInstance;
-    }
-
-    public void updateUserPreferenceState(boolean enabled) {
-        if (mUserPreferenceEnabled != enabled) {
-            mUserPreferenceEnabled = enabled;
-            updateRemoteDebuggingState();
-        }
-    }
-
-    void updateRemoteDebuggingState() {
-        if (mUserPreferenceEnabled != nativeIsRemoteDebuggingEnabled()) {
-            if (mUserPreferenceEnabled) {
-                nativeStartRemoteDebugging();
-            } else {
-                nativeStopRemoteDebugging();
-            }
-        }
-    }
-
-    private RemoteDebuggingController() {
-        mUserPreferenceEnabled = nativeIsRemoteDebuggingEnabled();
-    }
-
-    private static native void nativeStartRemoteDebugging();
-    private static native void nativeStopRemoteDebugging();
-    private static native boolean nativeIsRemoteDebuggingEnabled();
-}