Limit constrained windows to the size of the parent view.

chrome/browser/ui/views/frame/browser_view_layout.cc

Index: chrome/browser/ui/views/frame/browser_view_layout.cc
diff --git a/chrome/browser/ui/views/frame/browser_view_layout.cc b/chrome/browser/ui/views/frame/browser_view_layout.cc
index 571a098fc373bb06f7d9f9d95f4f2ba85f88c1ed..bf74f4020304ea2c0cabdab211cb3a637950c637 100644
--- a/chrome/browser/ui/views/frame/browser_view_layout.cc
+++ b/chrome/browser/ui/views/frame/browser_view_layout.cc
@@ -99,6 +99,10 @@ class BrowserViewLayout::WebContentsModalDialogHostViews
     return gfx::Point(middle_x - size.width() / 2, top_y);
   }
 
+  virtual gfx::Size GetMaximumDialogSize() OVERRIDE {
+    return browser_view_layout_->browser_view_->GetClientAreaBounds().size();
+  }
+
   // Add/remove observer.
   virtual void AddObserver(
       WebContentsModalDialogHostObserver* observer) OVERRIDE {