Implement http auth login dialog for OS X.

chrome/chrome.gyp

Index: chrome/chrome.gyp
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index 822940324294a2cd609a6a43b91338b2fe0adae1..560621498865babf67ba4351eee3ce91e34a0e83 100644
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -1346,6 +1346,8 @@
         'browser/login_prompt.cc',
         'browser/login_prompt.h',
         'browser/login_prompt_gtk.cc',
+        'browser/login_prompt_mac.h',
+        'browser/login_prompt_mac.mm',
         'browser/login_prompt_win.cc',
         'browser/memory_details.cc',
         'browser/memory_details.h',
@@ -2065,7 +2067,6 @@
             'browser/dock_info.cc',
             'browser/download/download_request_dialog_delegate_win.cc',
             'browser/jankometer.cc',
-            'browser/login_prompt.cc',
             'browser/password_manager/password_store_gnome.h',
             'browser/password_manager/password_store_gnome.cc',
             'browser/password_manager/password_store_kwallet.h',
@@ -2841,6 +2842,7 @@
         'app/nibs/FindBar.xib',
         'app/nibs/FirstRunDialog.xib',
         'app/nibs/HungRendererDialog.xib',
+        'app/nibs/HttpAuthLoginSheet.xib',
         'app/nibs/InfoBar.xib',
         'app/nibs/InfoBarContainer.xib',
         'app/nibs/ImportProgressDialog.xib',
@@ -4118,7 +4120,7 @@
             # Need to port browser/automation/ui_controls.h
             'browser/extensions/extension_process_manager_unittest.cc',
             'browser/importer/importer_unittest.cc',
-            'browser/login_prompt_unittest.cc',
+            'browser/login_prompt_uitest.cc',
             'browser/printing/print_job_unittest.cc',
             'browser/rlz/rlz_unittest.cc',
             'browser/safe_browsing/safe_browsing_blocking_page_unittest.cc',