Standardize usage of virtual/override/final in content/browser/

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index 0b4bfa80e8ae9efa8f8fb6808ee035362fac0549..7c181a8396dd928e93bb7e95d762c9c701776266 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -153,7 +153,7 @@ class GpuSandboxedProcessLauncherDelegate
       : ipc_fd_(host->TakeClientFileDescriptor()) {}
 #endif
 
-  virtual ~GpuSandboxedProcessLauncherDelegate() {}
+  ~GpuSandboxedProcessLauncherDelegate() override {}
 
 #if defined(OS_WIN)
   virtual bool ShouldSandbox() override {
@@ -250,9 +250,7 @@ class GpuSandboxedProcessLauncherDelegate
   }
 #elif defined(OS_POSIX)
 
-  virtual base::ScopedFD TakeIpcFd() override {
-    return ipc_fd_.Pass();
-  }
+  base::ScopedFD TakeIpcFd() override { return ipc_fd_.Pass(); }
 #endif  // OS_WIN
 
  private: