Refactor AppModalDialogQueue and move JS Alert boxes into a MVC.

chrome/chrome.gyp

Index: chrome/chrome.gyp
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index da52d1cfe98854b4c0ba302380246e2ccd7082dc..16a2c1eac50717b4927dbf0af0814cdfa0411a7e 100644
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -376,6 +376,9 @@
         'browser/alternate_nav_url_fetcher.h',
         'browser/app_controller_mac.h',
         'browser/app_controller_mac.mm',
+        'browser/app_modal_dialog.cc',
+        'browser/app_modal_dialog.h',
+        'browser/app_modal_dialog_win.cc',
         'browser/app_modal_dialog_queue.cc',
         'browser/app_modal_dialog_queue.h',
         'browser/autocomplete/autocomplete.cc',
@@ -786,12 +789,8 @@
         'browser/importer/mork_reader.h',
         'browser/jankometer.cc',
         'browser/jankometer.h',
-        'browser/js_before_unload_handler.h',
-        'browser/js_before_unload_handler_win.cc',
-        'browser/js_before_unload_handler_win.h',
+        'browser/jsmessage_box_handler.cc',
         'browser/jsmessage_box_handler.h',
-        'browser/jsmessage_box_handler_win.cc',
-        'browser/jsmessage_box_handler_win.h',
         'browser/load_from_memory_cache_details.h',
         'browser/load_notification_details.h',
         'browser/location_bar.h',
@@ -1157,6 +1156,8 @@
         'browser/views/infobars/infobars.h',
         'browser/views/input_window.cc',
         'browser/views/input_window.h',
+        'browser/views/jsmessage_box_dialog.cc',
+        'browser/views/jsmessage_box_dialog.h',
         'browser/views/keyword_editor_view.cc',
         'browser/views/keyword_editor_view.h',
         'browser/views/location_bar_view.cc',
@@ -2606,7 +2607,6 @@
             'views/widget/widget_gtk.h',
             'views/widget/widget_win.cc',
             'views/widget/widget_win.h',
-            'views/window/app_modal_dialog_delegate.h',
             'views/window/client_view.cc',
             'views/window/client_view.h',
             'views/window/custom_frame_view.cc',