Update from https://crrev.com/316786

base/memory/discardable_memory_unittest.cc

Index: base/memory/discardable_memory_unittest.cc
diff --git a/base/memory/discardable_memory_unittest.cc b/base/memory/discardable_memory_unittest.cc
index 45104131a95772b709af72050e7d02d4aa35c62b..fb1eba65d611422c315c06d9496eee38b554f8bf 100644
--- a/base/memory/discardable_memory_unittest.cc
+++ b/base/memory/discardable_memory_unittest.cc
@@ -82,16 +82,6 @@ TEST_P(DiscardableMemoryTest, DeleteWhileLocked) {
   ASSERT_TRUE(memory);
 }
 
-// Test forced purging.
-TEST_P(DiscardableMemoryTest, Purge) {
-  const scoped_ptr<DiscardableMemory> memory(CreateLockedMemory(kSize));
-  ASSERT_TRUE(memory);
-  memory->Unlock();
-
-  DiscardableMemory::PurgeForTesting();
-  EXPECT_EQ(DISCARDABLE_MEMORY_LOCK_STATUS_PURGED, memory->Lock());
-}
-
 #if !defined(NDEBUG) && !defined(OS_ANDROID)
 // Death tests are not supported with Android APKs.
 TEST_P(DiscardableMemoryTest, UnlockedMemoryAccessCrashesInDebugMode) {