Fix Clang style-plugin errors in 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
index 9f5aa9d347f1051c0be9875d541d5eae81732c38..3579161b5424840adcde701d1fdc356a5c88c94b 100644
--- a/components/memory_pressure/filtered_memory_pressure_calculator.cc
+++ b/components/memory_pressure/filtered_memory_pressure_calculator.cc
@@ -32,6 +32,9 @@ FilteredMemoryPressureCalculator::FilteredMemoryPressureCalculator(
       samples_taken_(false),
       cooldown_in_progress_(false) {}
 
+FilteredMemoryPressureCalculator::~FilteredMemoryPressureCalculator() {
+}
+
 FilteredMemoryPressureCalculator::MemoryPressureLevel
 FilteredMemoryPressureCalculator::CalculateCurrentPressureLevel() {
   base::TimeTicks now = tick_clock_->NowTicks();