GTTF: Add missing virtual destructors.

chrome/browser/extensions/api/page_capture/page_capture_api.h

Index: chrome/browser/extensions/api/page_capture/page_capture_api.h
diff --git a/chrome/browser/extensions/api/page_capture/page_capture_api.h b/chrome/browser/extensions/api/page_capture/page_capture_api.h
index e2d6ac42268abf2f817a42a034d438b4b26f4356..8f04d08e8e610a5094fb5fade44fcd58714550e2 100644
--- a/chrome/browser/extensions/api/page_capture/page_capture_api.h
+++ b/chrome/browser/extensions/api/page_capture/page_capture_api.h
@@ -29,6 +29,8 @@ class PageCaptureSaveAsMHTMLFunction : public AsyncExtensionFunction {
   // Test specific delegate used to test that the temporary file gets deleted.
   class TestDelegate {
    public:
+    virtual ~TestDelegate() { }
+
     // Called on the UI thread when the temporary file that contains the
     // generated data has been created.
     virtual void OnTemporaryFileCreated(const base::FilePath& temp_file) = 0;