Remove memory_pressure component.

components/memory_pressure/filtered_memory_pressure_calculator.cc

Index: components/memory_pressure/filtered_memory_pressure_calculator.cc
diff --git a/components/memory_pressure/filtered_memory_pressure_calculator.cc b/components/memory_pressure/filtered_memory_pressure_calculator.cc
deleted file mode 100644
index 3965196ae170915c5756bc1ac2bf051b902364b5..0000000000000000000000000000000000000000
--- a/components/memory_pressure/filtered_memory_pressure_calculator.cc
+++ /dev/null
@@ -1,79 +0,0 @@
-// Copyright 2015 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 "components/memory_pressure/filtered_memory_pressure_calculator.h"
-
-#include <algorithm>
-#include "base/time/tick_clock.h"
-
-namespace memory_pressure {
-
-#if defined(MEMORY_PRESSURE_IS_POLLING)
-
-FilteredMemoryPressureCalculator::FilteredMemoryPressureCalculator(
-    MemoryPressureCalculator* pressure_calculator,
-    base::TickClock* tick_clock)
-    : pressure_calculator_(pressure_calculator),
-      tick_clock_(tick_clock),
-      current_pressure_level_(
-          MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE),
-      samples_taken_(false),
-      cooldown_in_progress_(false) {
-  DCHECK(pressure_calculator);
-  DCHECK(tick_clock);
-}
-
-FilteredMemoryPressureCalculator::~FilteredMemoryPressureCalculator() {
-}
-
-FilteredMemoryPressureCalculator::MemoryPressureLevel
-FilteredMemoryPressureCalculator::CalculateCurrentPressureLevel() {
-  base::TimeTicks now = tick_clock_->NowTicks();
-
-  // Take a sample.
-  samples_taken_ = true;
-  last_sample_time_ = now;
-  MemoryPressureLevel level =
-      pressure_calculator_->CalculateCurrentPressureLevel();
-
-  // The pressure hasn't changed or has gone up. In either case this is the end
-  // of a cooldown period if one was in progress.
-  if (level >= current_pressure_level_) {
-    cooldown_in_progress_ = false;
-    current_pressure_level_ = level;
-    return level;
-  }
-
-  // The pressure has gone down, so apply cooldown hysteresis.
-  if (cooldown_in_progress_) {
-    cooldown_high_tide_ = std::max(cooldown_high_tide_, level);
-
-    // Get the cooldown period for the current level.
-    int cooldown_ms = kCriticalPressureCooldownPeriodMs;
-    if (current_pressure_level_ ==
-        MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE) {
-      cooldown_ms = kModeratePressureCooldownPeriodMs;
-    }
-    base::TimeDelta cooldown_period =
-        base::TimeDelta::FromMilliseconds(cooldown_ms);
-
-    if (now - cooldown_start_time_ >= cooldown_period) {
-      // The cooldown has completed successfully, so transition the pressure
-      // level.
-      cooldown_in_progress_ = false;
-      current_pressure_level_ = cooldown_high_tide_;
-    }
-  } else {
-    // Start a new cooldown period.
-    cooldown_in_progress_ = true;
-    cooldown_start_time_ = now;
-    cooldown_high_tide_ = level;
-  }
-
-  return current_pressure_level_;
-}
-
-#endif  // defined(MEMORY_PRESSURE_IS_POLLING)
-
-}  // namespace memory_pressure