Isolate ExternalProtocolHandlerTest from other tests in the TearDown method.

chrome/browser/external_protocol/external_protocol_handler_unittest.cc

 // 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.
 
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 
 #include "content/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
@@ skipping 84 matching lines @@
 class ExternalProtocolHandlerTest : public testing::Test {
  protected:
   ExternalProtocolHandlerTest()
       : ui_thread_(BrowserThread::UI, MessageLoop::current()),
         file_thread_(BrowserThread::FILE) {}
 
   virtual void SetUp() {
     file_thread_.Start();
   }
 
+  virtual void TearDown() {
+    // Ensure that g_accept_requests gets set back to true after test execution.
+    ExternalProtocolHandler::PermitLaunchUrl();
+  }
+
   void DoTest(ExternalProtocolHandler::BlockState block_state,
               ShellIntegration::DefaultWebClientState os_state,
               bool should_prompt, bool should_launch, bool should_block) {
     GURL url("mailto:test@test.com");
     ASSERT_FALSE(delegate_.has_prompted());
     ASSERT_FALSE(delegate_.has_launched());
     ASSERT_FALSE(delegate_.has_blocked());
 
     delegate_.set_block_state(block_state);
     delegate_.set_os_state(os_state);
@@ skipping 59 matching lines @@
   DoTest(ExternalProtocolHandler::UNKNOWN,
          ShellIntegration::NOT_DEFAULT_WEB_CLIENT,
          true, false, false);
 }
 
 TEST_F(ExternalProtocolHandlerTest, TestLaunchSchemeUnknownChromeUnknown) {
   DoTest(ExternalProtocolHandler::UNKNOWN,
          ShellIntegration::UNKNOWN_DEFAULT_WEB_CLIENT,
          true, false, false);
 }