Standardize usage of virtual/override/final specifiers.

content/browser/zygote_host/zygote_host_impl_linux.h

Index: content/browser/zygote_host/zygote_host_impl_linux.h
diff --git a/content/browser/zygote_host/zygote_host_impl_linux.h b/content/browser/zygote_host/zygote_host_impl_linux.h
index 0e746efdc991cac71d4e79c4a60fdb452b747223..e18e098088bfa04f0e5e59aac515c84c3646a43e 100644
--- a/content/browser/zygote_host/zygote_host_impl_linux.h
+++ b/content/browser/zygote_host/zygote_host_impl_linux.h
@@ -54,16 +54,16 @@ class CONTENT_EXPORT ZygoteHostImpl : public ZygoteHost {
                                                int* exit_code);
 
   // ZygoteHost implementation:
-  virtual pid_t GetPid() const override;
-  virtual int GetSandboxStatus() const override;
-  virtual void AdjustRendererOOMScore(base::ProcessHandle process_handle,
-                                      int score) override;
+  pid_t GetPid() const override;
+  int GetSandboxStatus() const override;
+  void AdjustRendererOOMScore(base::ProcessHandle process_handle,
+                              int score) override;
 
  private:
   friend struct DefaultSingletonTraits<ZygoteHostImpl>;
 
   ZygoteHostImpl();
-  virtual ~ZygoteHostImpl();
+  ~ZygoteHostImpl() override;
 
   // Notify the Zygote to exit immediately. This object should not be
   // used afterwards.