Removing useless Win7 checks + standardize its use

base/files/file_enumerator_win.cc

Index: base/files/file_enumerator_win.cc
diff --git a/base/files/file_enumerator_win.cc b/base/files/file_enumerator_win.cc
index 402a07209a8a24443d750481b75b9025540c2153..e629cc203e5e8892ca52fbf7d0b55987aa6324fa 100644
--- a/base/files/file_enumerator_win.cc
+++ b/base/files/file_enumerator_win.cc
@@ -9,7 +9,6 @@
 
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
-#include "base/win/windows_version.h"
 
 namespace base {
 
@@ -102,18 +101,14 @@ FilePath FileEnumerator::Next() {
       else
         src = src.Append(pattern_);
 
-      if (base::win::GetVersion() >= base::win::VERSION_WIN7) {
-        // Use a "large fetch" on newer Windows which should speed up large
-        // enumerations (we seldom abort in the middle).
-        find_handle_ = FindFirstFileEx(src.value().c_str(),
-                                       FindExInfoBasic,  // Omit short name.
-                                       &find_data_,
-                                       FindExSearchNameMatch,
-                                       NULL,
-                                       FIND_FIRST_EX_LARGE_FETCH);
-      } else {
-        find_handle_ = FindFirstFile(src.value().c_str(), &find_data_);
-      }
+      // Use a "large fetch" which should speed up large enumerations (we seldom
+      // abort in the middle).
+      find_handle_ = FindFirstFileEx(src.value().c_str(),
+                                     FindExInfoBasic,  // Omit short name.
+                                     &find_data_,
+                                     FindExSearchNameMatch,
+                                     NULL,
+                                     FIND_FIRST_EX_LARGE_FETCH);
       has_find_data_ = true;
     } else {
       // Search for the next file/directory.