[chromedriver] Stop supporting chrome 26. Don't run tests against it.

chrome/test/chromedriver/chrome/version.cc

 // Copyright (c) 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.
 
 #include "chrome/test/chromedriver/chrome/version.h"
 
 #include "base/stringprintf.h"
 
 namespace {
 
-const int kMinimumSupportedChromeVersion[] = {26, 0, 1395, 0};
+const int kMinimumSupportedChromeVersion[] = {27, 0, 1453, 0};
 
 }  // namespace
 
 // This variable must be able to be found and parsed by the upload script.
 const char kChromeDriverVersion[] = "0.9";
 
 const int kMinimumSupportedChromeBuildNo = kMinimumSupportedChromeVersion[2];
 
 std::string GetMinimumSupportedChromeVersion() {
   return base::StringPrintf(
       "%d.%d.%d.%d",
       kMinimumSupportedChromeVersion[0],
       kMinimumSupportedChromeVersion[1],
       kMinimumSupportedChromeVersion[2],
       kMinimumSupportedChromeVersion[3]);
 }