Move the core drag&drop code for Windows to content\browser to match Mac/GTK. I've had to add tempo…

chrome/chrome_browser.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2529 matching lines @@
         'browser/tab_contents/spelling_bubble_model.cc',
         'browser/tab_contents/spelling_bubble_model.h',
         'browser/tab_contents/spelling_menu_observer.cc',
         'browser/tab_contents/spelling_menu_observer.h',
         'browser/tab_contents/web_drag_bookmark_handler_gtk.cc',
         'browser/tab_contents/web_drag_bookmark_handler_gtk.h',
         'browser/tab_contents/web_drag_bookmark_handler_mac.h',
         'browser/tab_contents/web_drag_bookmark_handler_mac.mm',
         'browser/tab_contents/web_drag_bookmark_handler_win.cc',
         'browser/tab_contents/web_drag_bookmark_handler_win.h',
-        'browser/tab_contents/web_drag_source_win.cc',
-        'browser/tab_contents/web_drag_source_win.h',
-        'browser/tab_contents/web_drag_utils_win.cc',
-        'browser/tab_contents/web_drag_utils_win.h',
-        'browser/tab_contents/web_drop_target_win.cc',
-        'browser/tab_contents/web_drop_target_win.h',
         'browser/tabs/default_tab_handler.cc',
         'browser/tabs/default_tab_handler.h',
         'browser/tabs/pinned_tab_codec.cc',
         'browser/tabs/pinned_tab_codec.h',
         'browser/tabs/pinned_tab_service.cc',
         'browser/tabs/pinned_tab_service.h',
         'browser/tabs/pinned_tab_service_factory.cc',
         'browser/tabs/pinned_tab_service_factory.h',
         'browser/tabs/tab_handler.h',
         'browser/tabs/tab_finder.cc',
@@ skipping 3081 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }