Make SimpleCache the default backend on ChromeOS/Linux.

chrome/browser/profiles/profile_impl_io_data.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/browser/profiles/profile_impl_io_data.h"
 
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 55 matching lines @@
 #include "net/http/http_server_properties_manager.h"
 #include "net/sdch/sdch_owner.h"
 #include "net/ssl/channel_id_service.h"
 #include "net/url_request/url_request_intercepting_job_factory.h"
 #include "net/url_request/url_request_job_factory_impl.h"
 #include "storage/browser/quota/special_storage_policy.h"
 
 namespace {
 
 net::BackendType ChooseCacheBackendType() {
-#if defined(OS_ANDROID)
-  return net::CACHE_BACKEND_SIMPLE;
-#else
+#if !defined(OS_ANDROID)
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kUseSimpleCacheBackend)) {
     const std::string opt_value =
         command_line.GetSwitchValueASCII(switches::kUseSimpleCacheBackend);
     if (base::LowerCaseEqualsASCII(opt_value, "off"))
       return net::CACHE_BACKEND_BLOCKFILE;
     if (opt_value.empty() || base::LowerCaseEqualsASCII(opt_value, "on"))
       return net::CACHE_BACKEND_SIMPLE;
   }
   const std::string experiment_name =
       base::FieldTrialList::FindFullName("SimpleCacheTrial");
-  if (experiment_name == "ExperimentYes" ||
-      experiment_name == "ExperimentYes2") {
+  if (base::StartsWith(experiment_name, "Disable",
+                       base::CompareCase::INSENSITIVE_ASCII)) {
+    return net::CACHE_BACKEND_BLOCKFILE;
+  }
+  if (base::StartsWith(experiment_name, "ExperimentYes",
+                       base::CompareCase::INSENSITIVE_ASCII)) {
     return net::CACHE_BACKEND_SIMPLE;
   }
+#endif  // #if !defined(OS_ANDROID)
+
+#if defined(OS_ANDROID) || defined(OS_LINUX) || defined(OS_CHROMEOS)
+  return net::CACHE_BACKEND_SIMPLE;
+#else
   return net::CACHE_BACKEND_BLOCKFILE;
 #endif
 }
 
 }  // namespace
 
 using content::BrowserThread;
 
 ProfileImplIOData::Handle::Handle(Profile* profile)
     : io_data_(new ProfileImplIOData),
@@ skipping 677 matching lines @@
     const base::Closure& completion) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(initialized());
 
   DCHECK(transport_security_state());
   // Completes synchronously.
   transport_security_state()->DeleteAllDynamicDataSince(time);
   DCHECK(http_server_properties_manager_);
   http_server_properties_manager_->Clear(completion);
 }