Update from https://crrev.com/312600

base/chromeos/memory_pressure_observer_chromeos_unittest.cc

 // Copyright 2014 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 "base/basictypes.h"
 #include "base/chromeos/memory_pressure_observer_chromeos.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 24 matching lines @@
 bool WasOnMemoryPressureCalled() {
   bool b = on_memory_pressure_called;
   ResetOnMemoryPressureCalled();
   return b;
 }
 
 }  // namespace
 
 class TestMemoryPressureObserver : public MemoryPressureObserverChromeOS {
  public:
-  TestMemoryPressureObserver() : memory_in_percent_override_(0) {
+  TestMemoryPressureObserver() :
+    MemoryPressureObserverChromeOS(
+        MemoryPressureObserverChromeOS::THRESHOLD_DEFAULT),
+    memory_in_percent_override_(0) {
     // Disable any timers which are going on and set a special memory reporting
     // function.
     StopObserving();
   }
   ~TestMemoryPressureObserver() override {}
 
   void SetMemoryInPercentOverride(int percent) {
     memory_in_percent_override_ = percent;
   }
 
@@ skipping 96 matching lines @@
       EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
                 on_memory_pressure_level);
       break;
     }
   }
   // We should have needed exactly the same amount of checks as before.
   EXPECT_EQ(j, i);
 }
 
 }  // namespace base