Remove all code for chrome.experimental.speechInput extension API

chrome/test/data/extensions/api_test/speech_input/start_stop/test.js

-// Copyright (c) 2011 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.
-
-// Extension Speech Input api test.
-// browser_tests --gtest_filter="ExtensionSpeechInputApiTest.*"
-
-chrome.test.runTests([
-  function testSpeechInputStartStop() {
-    var count = 0;
-
-    // Recording is not active, start it.
-    chrome.experimental.speechInput.isRecording(function(recording) {
-      chrome.test.assertNoLastError();
-      chrome.test.assertFalse(recording);
-      chrome.experimental.speechInput.start({}, started);
-    });
-
-    // There should be no error and recording should be active. Stop it.
-    function started() {
-      chrome.test.assertNoLastError();
-      chrome.experimental.speechInput.isRecording(function(recording) {
-        chrome.test.assertNoLastError();
-        chrome.test.assertTrue(recording);
-        chrome.experimental.speechInput.stop(stopped);
-      });
-    }
-
-    // There should be no error and recording shouldn't be active again.
-    // Restart recording if not repeated at least 3 times.
-    function stopped() {
-      chrome.test.assertNoLastError();
-      chrome.experimental.speechInput.isRecording(function(recording) {
-        chrome.test.assertNoLastError();
-        chrome.test.assertFalse(recording);
-        if (++count < 3)
-          chrome.experimental.speechInput.start({}, started);
-        else
-          chrome.test.succeed();
-      });
-    }
-  },
-
-  function testSpeechInputInvalidOperation() {
-    // Calling start once recording should generate an invalid operation error.
-    chrome.experimental.speechInput.stop(function() {
-      chrome.test.assertEq(chrome.runtime.lastError.message,
-          "invalidOperation");
-      chrome.experimental.speechInput.start({}, started);
-    });
-
-    // Calling stop before recording should generate an invalid operation error.
-    function started() {
-      chrome.test.assertNoLastError();
-      chrome.experimental.speechInput.start({}, function() {
-        chrome.test.assertEq(chrome.runtime.lastError.message,
-            "invalidOperation");
-        chrome.test.succeed();
-      });
-    }
-  }
-]);