Remove GetDefaultProfile from various Android related code

chrome/browser/android/signin/signin_manager_android.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 "chrome/browser/android/signin/signin_manager_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 56 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ProfileDataRemover);
 };
 
 }  // namespace
 
 SigninManagerAndroid::SigninManagerAndroid(JNIEnv* env, jobject obj)
     : profile_(NULL),
       weak_factory_(this) {
   java_signin_manager_.Reset(env, obj);
-  DCHECK(g_browser_process);
-  DCHECK(g_browser_process->profile_manager());
-  profile_ = g_browser_process->profile_manager()->GetDefaultProfile();
+  profile_ = ProfileManager::GetActiveUserProfile();
   DCHECK(profile_);
 }
 
 SigninManagerAndroid::~SigninManagerAndroid() {}
 
 void SigninManagerAndroid::CheckPolicyBeforeSignIn(JNIEnv* env,
                                                    jobject obj,
                                                    jstring username) {
 #if defined(ENABLE_CONFIGURATION_POLICY)
   username_ = base::android::ConvertJavaStringToUTF8(env, username);
@@ skipping 156 matching lines @@
   return !policy::BrowserPolicyConnector::IsNonEnterpriseUser(username);
 #else
   return false;
 #endif
 }
 
 // static
 bool SigninManagerAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }