Tell the RWH about the intial window size for drop down menus.

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/renderer_host/render_widget_host_view_gtk.h"
 
 // If this gets included after the gtk headers, then a bunch of compiler
 // errors happen because of a "#define Status int" in Xlib.h, which interacts
 // badly with URLRequestStatus::Status.
 #include "chrome/common/render_messages.h"
@@ skipping 340 matching lines @@
         NULL,
         GDK_CURRENT_TIME);
     // We grab keyboard events too so things like alt+tab are eaten.
     gdk_keyboard_grab(parent_->window, TRUE, GDK_CURRENT_TIME);
 
     // Our parent widget actually keeps GTK focus within its window, but we have
     // to make the webkit selection box disappear to maintain appearances.
     parent_host_view->Blur();
   }
 
-  gtk_widget_set_size_request(view_.get(),
-                              std::min(pos.width(), kMaxWindowWidth),
+  requested_size_ = gfx::Size(std::min(pos.width(), kMaxWindowWidth),
                               std::min(pos.height(), kMaxWindowHeight));
+  host_->WasResized();
+  gtk_widget_set_size_request(view_.get(), requested_size_.width(),
+                              requested_size_.height());
 
   gtk_window_set_default_size(GTK_WINDOW(popup), -1, -1);
   // Don't allow the window to be resized. This also forces the window to
   // shrink down to the size of its child contents.
   gtk_window_set_resizable(GTK_WINDOW(popup), FALSE);
   gtk_window_move(GTK_WINDOW(popup), pos.x(), pos.y());
   gtk_widget_show_all(popup);
 }
 
 void RenderWidgetHostViewGtk::DidBecomeSelected() {
@@ skipping 283 matching lines @@
     const NativeWebKeyboardEvent& event) {
   if (!host_)
     return;
 
   EditCommands edit_commands;
   if (key_bindings_handler_->Match(event, &edit_commands)) {
     host_->ForwardEditCommandsForNextKeyEvent(edit_commands);
   }
   host_->ForwardKeyboardEvent(event);
 }