Introduce SessionManager that will contain code to start user session on Chrome OS

chrome/browser/chromeos/login/login_utils_browsertest.cc

Index: chrome/browser/chromeos/login/login_utils_browsertest.cc
diff --git a/chrome/browser/chromeos/login/login_utils_browsertest.cc b/chrome/browser/chromeos/login/login_utils_browsertest.cc
index 3acd197063edd62c36a2643f53ed935f2715481c..f34d541e19bcf66879f6eb6f0930af1527900e0d 100644
--- a/chrome/browser/chromeos/login/login_utils_browsertest.cc
+++ b/chrome/browser/chromeos/login/login_utils_browsertest.cc
@@ -358,7 +358,7 @@ class LoginUtilsTest : public testing::Test,
   }
 
 #if defined(ENABLE_RLZ)
-  virtual void OnRlzInitialized(Profile* profile) OVERRIDE {
+  virtual void OnRlzInitialized() OVERRIDE {
     rlz_initialized_cb_.Run();
   }
 #endif
@@ -411,7 +411,6 @@ class LoginUtilsTest : public testing::Test,
     const bool kHasActiveSession = false;
     user_context.SetAuthFlow(UserContext::AUTH_FLOW_GAIA_WITHOUT_SAML);
     LoginUtils::Get()->PrepareProfile(user_context,
-                                      std::string(),
                                       kHasCookies,
                                       kHasActiveSession,
                                       this);