Revert of base: Introduce an explicit call for reducing emulated discardable memory usage.

base/memory/discardable_memory_android.cc

Index: base/memory/discardable_memory_android.cc
diff --git a/base/memory/discardable_memory_android.cc b/base/memory/discardable_memory_android.cc
index acf29ac85f11eb19df32b638048d4ded8e9990a5..8988c2b8d2bd46d759ec2f9c42243b6274d114be 100644
--- a/base/memory/discardable_memory_android.cc
+++ b/base/memory/discardable_memory_android.cc
@@ -32,7 +32,10 @@
 // Holds the shared state used for allocations.
 struct SharedState {
   SharedState()
-      : manager(kAshmemMemoryLimit, kAshmemMemoryLimit, TimeDelta::Max()),
+      : manager(kAshmemMemoryLimit,
+                kAshmemMemoryLimit,
+                kAshmemMemoryLimit,
+                TimeDelta::Max()),
         allocator(kAshmemAllocatorName,
                   GetOptimalAshmemRegionSizeForAllocator()) {}
 
@@ -42,6 +45,16 @@
 LazyInstance<SharedState>::Leaky g_shared_state = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
+
+// static
+void DiscardableMemory::RegisterMemoryPressureListeners() {
+  internal::DiscardableMemoryEmulated::RegisterMemoryPressureListeners();
+}
+
+// static
+void DiscardableMemory::UnregisterMemoryPressureListeners() {
+  internal::DiscardableMemoryEmulated::UnregisterMemoryPressureListeners();
+}
 
 // static
 bool DiscardableMemory::ReduceMemoryUsage() {