Removing useless Win7 checks + standardize its use

chrome/browser/ui/views/frame/taskbar_decorator_win.cc

Index: chrome/browser/ui/views/frame/taskbar_decorator_win.cc
diff --git a/chrome/browser/ui/views/frame/taskbar_decorator_win.cc b/chrome/browser/ui/views/frame/taskbar_decorator_win.cc
index 5f99203a94d326e981e6e0cd87683dbe94757404..aab7e5a5f4e672d496e059abff6411862c4d60f3 100644
--- a/chrome/browser/ui/views/frame/taskbar_decorator_win.cc
+++ b/chrome/browser/ui/views/frame/taskbar_decorator_win.cc
@@ -12,7 +12,6 @@
 #include "base/task_scheduler/post_task.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/scoped_gdi_object.h"
-#include "base/win/windows_version.h"
 #include "chrome/browser/profiles/profile_avatar_icon_util.h"
 #include "skia/ext/image_operations.h"
 #include "skia/ext/platform_canvas.h"
@@ -69,9 +68,6 @@ void SetOverlayIcon(HWND hwnd, std::unique_ptr<SkBitmap> bitmap) {
 }  // namespace
 
 void DrawTaskbarDecoration(gfx::NativeWindow window, const gfx::Image* image) {
-  if (base::win::GetVersion() < base::win::VERSION_WIN7)
-    return;
-
   HWND hwnd = views::HWNDForNativeWindow(window);
 
   // SetOverlayIcon() does nothing if the window is not visible so testing here