Move RedirectChromeLogging to src/chromeos.

chrome/browser/chromeos/login/session/user_session_manager.cc

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index 607e9fa10a0bc70e0dd31f019e2fffda757bf6a7..73d8c28ca9aa1bf709009f2f41483ab61f9eae50 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -38,6 +38,7 @@
 #include "chrome/browser/chromeos/first_run/first_run.h"
 #include "chrome/browser/chromeos/first_run/goodies_displayer.h"
 #include "chrome/browser/chromeos/input_method/input_method_util.h"
+#include "chrome/browser/chromeos/logging.h"
 #include "chrome/browser/chromeos/login/auth/chrome_cryptohome_authenticator.h"
 #include "chrome/browser/chromeos/login/chrome_restart_request.h"
 #include "chrome/browser/chromeos/login/demo_mode/demo_app_launcher.h"
@@ -979,8 +980,12 @@ void UserSessionManager::CreateUserSession(const UserContext& user_context,
 
 void UserSessionManager::PreStartSession() {
   // Switch log file as soon as possible.
-  if (base::SysInfo::IsRunningOnChromeOS())
-    logging::RedirectChromeLogging(*(base::CommandLine::ForCurrentProcess()));
+  if (base::SysInfo::IsRunningOnChromeOS()) {
+    base::PostTaskWithTraits(
+        FROM_HERE, {base::MayBlock()},
+        base::Bind(&logging::RedirectChromeLogging,
+                   *base::CommandLine::ForCurrentProcess()));
+  }
 }
 
 void UserSessionManager::StoreUserContextDataBeforeProfileIsCreated() {