Update from https://crrev.com/316786

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 de7112457dea7a17ce0d6483af7dc931168f1261..27b390f4aa01060cabedd1810d2aeccaff62cb0e 100644
--- a/base/memory/discardable_memory_android.cc
+++ b/base/memory/discardable_memory_android.cc
@@ -44,11 +44,6 @@ LazyInstance<SharedState>::Leaky g_shared_state = LAZY_INSTANCE_INITIALIZER;
 }  // namespace
 
 // static
-void DiscardableMemory::ReleaseFreeMemory() {
-  internal::DiscardableMemoryShmem::ReleaseFreeMemory();
-}
-
-// static
 bool DiscardableMemory::ReduceMemoryUsage() {
   return internal::DiscardableMemoryEmulated::ReduceMemoryUsage();
 }
@@ -104,11 +99,4 @@ scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemoryWithType(
   return nullptr;
 }
 
-// static
-void DiscardableMemory::PurgeForTesting() {
-  g_shared_state.Pointer()->manager.PurgeAll();
-  internal::DiscardableMemoryEmulated::PurgeForTesting();
-  internal::DiscardableMemoryShmem::PurgeForTesting();
-}
-
 }  // namespace base