Revert "Reland "Move a bunch of ChromeOS APIs out of chrome/browser/extensions."""

This reverts commit fd92fe3ff7c0a4a0da97da00cdf6bd5476c46195.

BUG=
TEST=

Review URL: http://codereview.chromium.org/8713006

git-svn-id: http://src.chromium.org/svn/trunk/src/build@111663 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -308,13 +308,18 @@
           'enable_flapper_hacks%': 0,
         }],
 
-        # Enable file manager extension on Chrome OS.
-        ['chromeos==1', {
+        # Enable file manager extension on Chrome OS or Aura.
+        ['chromeos==1 or use_aura==1', {
           'file_manager_extension%': 1,
         }, {
           'file_manager_extension%': 0,
         }],
 
+        # ... except on Windows even with Aura.
+        ['use_aura==1 and OS=="win"', {
+          'file_manager_extension%': 0,
+        }],
+
         # Enable WebUI TaskManager always on Chrome OS or Aura.
         ['chromeos==1 or use_aura==1', {
           'webui_task_manager%': 1,