A bunch of cleanups to beforeunload/unload handling.
1. Remove all the is_closing_browser plumbing. WebContents/TabContents/RenderViewHost/etc really shouldn't (and don't!) need to know anything about whether we're closing the browser or not. 
2. Refactor the handling of beforeunload/unload state in browser.cc. I think this makes it considerably easier to reason about the correctness of it.
3. Added a couple TODOs for future cleanups that would have made this change a bit too large.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/renderer/render_view.cc b/chrome/renderer/render_view.cc
index 28a9195..478efaa 100644
--- a/chrome/renderer/render_view.cc
+++ b/chrome/renderer/render_view.cc
@@ -2425,16 +2425,13 @@
       frame_url, data, static_cast<int32>(status)));
 }
 
-void RenderView::OnMsgShouldClose(bool is_closing_browser) {
+void RenderView::OnMsgShouldClose() {
   bool should_close = webview()->ShouldClose();
-
-  Send(new ViewHostMsg_ShouldClose_ACK(routing_id_, should_close,
-                                       is_closing_browser));
+  Send(new ViewHostMsg_ShouldClose_ACK(routing_id_, should_close));
 }
 
 void RenderView::OnClosePage(int new_render_process_host_id,
-                             int new_request_id,
-                             bool is_closing_browser) {
+                             int new_request_id) {
   // TODO(creis): We'd rather use webview()->Close() here, but that currently
   // sets the WebView's delegate_ to NULL, preventing any JavaScript dialogs
   // in the onunload handler from appearing.  For now, we're bypassing that and
@@ -2448,8 +2445,7 @@
 
   Send(new ViewHostMsg_ClosePage_ACK(routing_id_,
                                      new_render_process_host_id,
-                                     new_request_id,
-                                     is_closing_browser));
+                                     new_request_id));
 }
 
 void RenderView::OnThemeChanged() {