replace 'virtual ... OVERRIDE' with '... override'

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 d928513527ea895f1e44ebd3a0415bfe446e3319..4fb394ed0666f847d7c60860d3b26d7e2c9a9238 100644
--- a/base/memory/discardable_memory_emulated.h
+++ b/base/memory/discardable_memory_emulated.h
@@ -31,14 +31,14 @@ class DiscardableMemoryEmulated
   bool Initialize();
 
   // Overridden from DiscardableMemory:
-  virtual DiscardableMemoryLockStatus Lock() OVERRIDE;
-  virtual void Unlock() OVERRIDE;
-  virtual void* Memory() const OVERRIDE;
+  DiscardableMemoryLockStatus Lock() override;
+  void Unlock() override;
+  void* Memory() const override;
 
   // Overridden from internal::DiscardableMemoryManagerAllocation:
-  virtual bool AllocateAndAcquireLock() OVERRIDE;
-  virtual void ReleaseLock() OVERRIDE {}
-  virtual void Purge() OVERRIDE;
+  bool AllocateAndAcquireLock() override;
+  void ReleaseLock() override {}
+  void Purge() override;
 
  private:
   const size_t bytes_;