Cleanup: remove use_existing_browser infrastructure from ui_test.

chrome/app/chrome_main_uitest.cc

 // Copyright (c) 2006-2008 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/test/ui/ui_test.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "net/base/net_util.h"
 
@@ skipping 28 matching lines @@
   EXPECT_EQ(1, GetTabCount());
 }
 
 #if defined(OS_MACOSX)
 // Fails an SQL assertion on Mac: http://crbug.com/45108
 #define SecondLaunch DISABLED_SecondLaunch
 #endif
 // Make sure that the second invocation creates a new window.
 TEST_F(ChromeMainTest, SecondLaunch) {
   include_testing_id_ = false;
-  use_existing_browser_ = true;
 
   ASSERT_TRUE(LaunchAnotherBrowserBlockUntilClosed(
                   CommandLine(CommandLine::ARGUMENTS_ONLY)));
 
   ASSERT_TRUE(automation()->WaitForWindowCountToBecome(2));
 }
 
 #if defined(OS_MACOSX)
 // Fails an SQL assertion on Mac: http://crbug.com/45108
 #define ReuseBrowserInstanceWhenOpeningFile \
     DISABLED_ReuseBrowserInstanceWhenOpeningFile
 #endif
 TEST_F(ChromeMainTest, ReuseBrowserInstanceWhenOpeningFile) {
   include_testing_id_ = false;
-  use_existing_browser_ = true;
 
   FilePath test_file = test_data_directory_.AppendASCII("empty.html");
 
   CommandLine command_line(CommandLine::ARGUMENTS_ONLY);
   command_line.AppendLooseValue(test_file.ToWStringHack());
   ASSERT_TRUE(LaunchAnotherBrowserBlockUntilClosed(command_line));
 
   ASSERT_TRUE(automation()->IsURLDisplayed(net::FilePathToFileURL(test_file)));
 }