Revert of Use DiscardableMemoryManager on Android.

base/memory/discardable_memory_manager.h

Index: base/memory/discardable_memory_manager.h
diff --git a/base/memory/discardable_memory_manager.h b/base/memory/discardable_memory_manager.h
index 3c9bd6151558b7d3ec501ef6c740d2d14b5bc31e..844752151e64fe0b06df2a88fe2ab43da0fe619e 100644
--- a/base/memory/discardable_memory_manager.h
+++ b/base/memory/discardable_memory_manager.h
@@ -21,7 +21,7 @@
   // Allocate and acquire a lock that prevents the allocation from being purged
   // by the system. Returns true if memory was previously allocated and is still
   // resident.
-  virtual bool AllocateAndAcquireLock() = 0;
+  virtual bool AllocateAndAcquireLock(size_t bytes) = 0;
 
   // Release a previously acquired lock on the allocation so that it can be
   // purged by the system.