[Prerender] Get the prerender mode from Finch field trial.

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ppapi/features/features.h"
@@ skipping 725 matching lines @@
 const char kPrerenderFromOmnibox[]          = "prerender-from-omnibox";
 
 // These are the values the kPrerenderFromOmnibox switch may have, as in
 // "--prerender-from-omnibox=auto". auto: Allow field trial selection.
 const char kPrerenderFromOmniboxSwitchValueAuto[] = "auto";
 //   disabled: No prerendering.
 const char kPrerenderFromOmniboxSwitchValueDisabled[] = "disabled";
 //   enabled: Guaranteed prerendering.
 const char kPrerenderFromOmniboxSwitchValueEnabled[] = "enabled";
 
-// Controls speculative prerendering of pages, and content prefetching. Both
-// are dispatched from <link rel=prefetch href=...> elements.
-const char kPrerenderMode[]                 = "prerender";
-
-// These are the values the kPrerenderMode switch may have, as in
-// "--prerender=disabled".
-//   disabled: No prerendering.
-const char kPrerenderModeSwitchValueDisabled[] = "disabled";
-//   enabled: Prerendering.
-const char kPrerenderModeSwitchValueEnabled[] = "enabled";
-//   prefetch: NoState Prefetch experiment.
-const char kPrerenderModeSwitchValuePrefetch[] = "prefetch";
-//   simple-load: experiment with prerendering disabled but metrics reporting
-//                enabled, to use as a reference for comparisons.
-const char kPrerenderModeSwitchValueSimpleLoad[] = "simple-load";
-
 // Use IPv6 only for privet HTTP.
 const char kPrivetIPv6Only[]                   = "privet-ipv6-only";
 
 // Outputs the product version information and quit. Used as an internal api to
 // detect the installed version of Chrome on Linux.
 const char kProductVersion[]                = "product-version";
 
 // Selects directory of profile to associate with the first browser launched.
 const char kProfileDirectory[]              = "profile-directory";
 
@@ skipping 541 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR VERY NICE FLAGS TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches