Standardize usage of virtual/override/final in content/

content/test/plugin/plugin_request_read_test.h

Index: content/test/plugin/plugin_request_read_test.h
diff --git a/content/test/plugin/plugin_request_read_test.h b/content/test/plugin/plugin_request_read_test.h
index e0a0836beaa0e336d39d41f1268f1736dca69c33..cbb0f904dce3e689ab068b6a545d24eb57d241e8 100644
--- a/content/test/plugin/plugin_request_read_test.h
+++ b/content/test/plugin/plugin_request_read_test.h
@@ -18,20 +18,24 @@ namespace NPAPIClient {
 class PluginRequestReadTest : public PluginTest {
  public:
   PluginRequestReadTest(NPP id, NPNetscapeFuncs* host_functions);
-  virtual ~PluginRequestReadTest();
+  ~PluginRequestReadTest() override;
 
   //
   // NPAPI Functions
   //
-  virtual NPError New(uint16 mode, int16 argc, const char* argn[],
-                      const char* argv[], NPSavedData* saved) override;
-  virtual NPError SetWindow(NPWindow* window) override;
-  virtual NPError NewStream(NPMIMEType type, NPStream* stream,
-                            NPBool seekable, uint16* stream_type) override;
-  virtual NPError DestroyStream(NPStream *stream, NPError reason) override;
-  virtual int32 WriteReady(NPStream* stream) override;
-  virtual int32 Write(NPStream* stream, int32 offset, int32 len,
-                      void* buffer) override;
+  NPError New(uint16 mode,
+              int16 argc,
+              const char* argn[],
+              const char* argv[],
+              NPSavedData* saved) override;
+  NPError SetWindow(NPWindow* window) override;
+  NPError NewStream(NPMIMEType type,
+                    NPStream* stream,
+                    NPBool seekable,
+                    uint16* stream_type) override;
+  NPError DestroyStream(NPStream* stream, NPError reason) override;
+  int32 WriteReady(NPStream* stream) override;
+  int32 Write(NPStream* stream, int32 offset, int32 len, void* buffer) override;
 
  private:
   // Tracks ranges, which we requested, but for which we did not get response.