Removing useless Win7 checks + standardize its use

chrome/browser/shell_integration_win.cc

Index: chrome/browser/shell_integration_win.cc
diff --git a/chrome/browser/shell_integration_win.cc b/chrome/browser/shell_integration_win.cc
index 06dbc42d025ac612636b61e19ce233ebdeec3f5f..5634a67af07273bd8f218f8b2ab848e293cac000 100644
--- a/chrome/browser/shell_integration_win.cc
+++ b/chrome/browser/shell_integration_win.cc
@@ -728,9 +728,6 @@ base::string16 GetChromiumModelIdForProfile(
 }
 
 void MigrateTaskbarPins() {
-  if (base::win::GetVersion() < base::win::VERSION_WIN7)
-    return;
-
   // This needs to happen eventually (e.g. so that the appid is fixed and the
   // run-time Chrome icon is merged with the taskbar shortcut), but this is not
   // urgent and shouldn't delay Chrome startup.
@@ -749,8 +746,6 @@ void GetIsPinnedToTaskbarState(
 
 int MigrateShortcutsInPathInternal(const base::FilePath& chrome_exe,
                                    const base::FilePath& path) {
-  DCHECK(base::win::GetVersion() >= base::win::VERSION_WIN7);
-
   // Enumerate all pinned shortcuts in the given path directly.
   base::FileEnumerator shortcuts_enum(
       path, false,  // not recursive