Add data reduction functionality to all platforms.

components/precache/content/precache_manager.cc

 // Copyright 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 "components/precache/content/precache_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 37 matching lines @@
 
 // static
 bool PrecacheManager::IsPrecachingEnabled() {
   return base::FieldTrialList::FindFullName(kPrecacheFieldTrialName) ==
              kPrecacheFieldTrialEnabledGroup ||
          CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnablePrecache);
 }
 
 bool PrecacheManager::IsPrecachingAllowed() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-#if defined(SPDY_PROXY_AUTH_ORIGIN)
   return user_prefs::UserPrefs::Get(browser_context_)->GetBoolean(
       data_reduction_proxy::prefs::kDataReductionProxyEnabled);
-#else
-  return false;
-#endif
 }
 
 void PrecacheManager::StartPrecaching(
     const PrecacheCompletionCallback& precache_completion_callback,
     URLListProvider* url_list_provider) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (is_precaching_) {
     DLOG(WARNING) << "Cannot start precaching because precaching is already "
                      "in progress.";
@@ skipping 93 matching lines @@
     return;
   }
 
   // Start precaching.
   precache_fetcher_.reset(
       new PrecacheFetcher(urls, browser_context_->GetRequestContext(), this));
   precache_fetcher_->Start();
 }
 
 }  // namespace precache