Introduce incognito preference settings.

net/proxy/proxy_config_service_linux.cc

Index: net/proxy/proxy_config_service_linux.cc
diff --git a/net/proxy/proxy_config_service_linux.cc b/net/proxy/proxy_config_service_linux.cc
index 3867df103d3052ec09090e308ebf2e0ba3b62df9..ab092d5fc5ded6391c54a2b1d1cc89ca55cefef9 100644
--- a/net/proxy/proxy_config_service_linux.cc
+++ b/net/proxy/proxy_config_service_linux.cc
@@ -26,6 +26,7 @@
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
 #include "base/task.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/timer.h"
 #include "base/nix/xdg_util.h"
 #include "googleurl/src/url_canon.h"
@@ -435,6 +436,9 @@ class GConfSettingGetterImplKDE
       : inotify_fd_(-1), notify_delegate_(NULL), indirect_manual_(false),
         auto_no_pac_(false), reversed_bypass_list_(false),
         env_var_getter_(env_var_getter), file_loop_(NULL) {
+    // TODO(mdm): This is called in UI thread (bug 69057).
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+
     // Derive the location of the kde config dir from the environment.
     std::string home;
     if (env_var_getter->GetVar("KDEHOME", &home) && !home.empty()) {
@@ -502,6 +506,8 @@ class GConfSettingGetterImplKDE
 
   virtual bool Init(MessageLoop* glib_default_loop,
                     MessageLoopForIO* file_loop) {
+    // TODO(mdm): This is called in UI thread (bug 69057).
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     DCHECK(inotify_fd_ < 0);
     inotify_fd_ = inotify_init();
     if (inotify_fd_ < 0) {
@@ -1074,6 +1080,7 @@ ProxyConfigServiceLinux::Delegate::Delegate(base::Environment* env_var_getter)
       break;
     case base::nix::DESKTOP_ENVIRONMENT_KDE3:
     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
+      // TODO(mdm): This is called in UI thread (bug 69057).
       gconf_getter_.reset(new GConfSettingGetterImplKDE(env_var_getter));
       break;
     case base::nix::DESKTOP_ENVIRONMENT_XFCE: