Fix uninitialized read in unit tests

chrome/browser/chromeos/session_length_limiter_unittest.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/chromeos/session_length_limiter.h"
 
 #include <queue>
 #include <utility>
 #include <vector>
 
@@ skipping 167 matching lines @@
 
 bool MockTimeSingleThreadTaskRunner::TemporalOrder::operator()(
     const std::pair<base::TimeTicks, base::Closure>& first_task,
     const std::pair<base::TimeTicks, base::Closure>& second_task) const {
   return first_task.first >= second_task.first;
 }
 
 MockTimeSingleThreadTaskRunner::~MockTimeSingleThreadTaskRunner() {
 }
 
-SessionLengthLimiterTest::SessionLengthLimiterTest() : delegate_(NULL) {
+SessionLengthLimiterTest::SessionLengthLimiterTest()
+    : user_activity_seen_(false),
+      delegate_(NULL) {
 }
 
 void SessionLengthLimiterTest::SetUp() {
   TestingBrowserProcess::GetGlobal()->SetLocalState(&local_state_);
   SessionLengthLimiter::RegisterPrefs(local_state_.registry());
   runner_ = new MockTimeSingleThreadTaskRunner;
 }
 
 void SessionLengthLimiterTest::TearDown() {
   session_length_limiter_.reset();
@@ skipping 640 matching lines @@
   runner_->FastForwardBy(base::TimeDelta::FromSeconds(50));
 
   // Remove the session length limit.
   ClearSessionLengthLimitPref();
 
   // Verify that no timer fires to terminate the session.
   runner_->FastForwardUntilNoTasksRemain();
 }
 
 }  // namespace chromeos