Update from https://crrev.com/316786

base/memory/discardable_memory_emulated.h

Index: base/memory/discardable_memory_emulated.h
diff --git a/base/memory/discardable_memory_emulated.h b/base/memory/discardable_memory_emulated.h
index 150c1ab5669b07de010fa68cb4bc966bbec1d998..aa01a9de34af4bf0e0ef5d0e4aa2ebf5ecb27847 100644
--- a/base/memory/discardable_memory_emulated.h
+++ b/base/memory/discardable_memory_emulated.h
@@ -26,8 +26,6 @@ class DiscardableMemoryEmulated
   // unavailable in kernel space. crbug.com/400423
   BASE_EXPORT static void ReduceMemoryUsageUntilWithinLimit(size_t bytes);
 
-  static void PurgeForTesting();
-
   bool Initialize();
 
   // Overridden from DiscardableMemory:
@@ -39,7 +37,6 @@ class DiscardableMemoryEmulated
   bool AllocateAndAcquireLock() override;
   void ReleaseLock() override {}
   void Purge() override;
-  bool IsMemoryResident() const override;
 
  private:
   const size_t bytes_;