Move file_util to base/files/ directory.

base/base.gypi

Index: base/base.gypi
diff --git a/base/base.gypi b/base/base.gypi
index fd64aefd007647b5d4a89fcf8c3ddb961178a722..bf8bd59d9371bdd614b3e65d13cae50f0fcaf2a9 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -176,13 +176,6 @@
           'environment.cc',
           'environment.h',
           'file_descriptor_posix.h',
-          'file_util.cc',
-          'file_util.h',
-          'file_util_android.cc',
-          'file_util_linux.cc',
-          'file_util_mac.mm',
-          'file_util_posix.cc',
-          'file_util_win.cc',
           'file_version_info.h',
           'file_version_info_mac.h',
           'file_version_info_mac.mm',
@@ -213,8 +206,15 @@
           'files/file_posix.cc',
           'files/file_proxy.cc',
           'files/file_proxy.h',
+          'files/file_util.cc',
+          'files/file_util.h',
+          'files/file_util_android.cc',
+          'files/file_util_linux.cc',
+          'files/file_util_mac.mm',
+          'files/file_util_posix.cc',
           'files/file_util_proxy.cc',
           'files/file_util_proxy.h',
+          'files/file_util_win.cc',
           'files/file_win.cc',
           'files/important_file_writer.h',
           'files/important_file_writer.cc',
@@ -756,14 +756,14 @@
                'base_paths.cc',
                'cpu.cc',
                'debug/stack_trace_posix.cc',
-               'file_util.cc',
-               'file_util_posix.cc',
                'files/file_enumerator_posix.cc',
                'files/file_path_watcher_fsevents.cc',
                'files/file_path_watcher_fsevents.h',
                'files/file_path_watcher_kqueue.cc',
                'files/file_path_watcher_kqueue.h',
                'files/file_proxy.cc',
+               'files/file_util.cc',
+               'files/file_util_posix.cc',
                'files/file_util_proxy.cc',
                'memory/shared_memory_posix.cc',
                'native_library_posix.cc',
@@ -839,7 +839,7 @@
               # by file name rules).
               ['include', '^atomicops_internals_mac\\.'],
               ['include', '^base_paths_mac\\.'],
-              ['include', '^file_util_mac\\.'],
+              ['include', '^files/file_util_mac\\.'],
               ['include', '^file_version_info_mac\\.'],
               ['include', '^mac/bundle_locations\\.'],
               ['include', '^mac/foundation_util\\.'],
@@ -943,7 +943,7 @@
             'sources/': [
               ['exclude', '^files/file_path_watcher_linux\\.cc$'],
               ['exclude', '^files/file_path_watcher_stub\\.cc$'],
-              ['exclude', '^file_util_linux\\.cc$'],
+              ['exclude', '^files/file_util_linux\\.cc$'],
               ['exclude', '^process/process_linux\\.cc$'],
               ['exclude', '^sys_info_linux\\.cc$'],
             ],