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..09266cec309ad243e5f5fc348d805b65907ea292 100644
--- a/chrome/browser/ui/views/frame/browser_view_layout.cc
+++ b/chrome/browser/ui/views/frame/browser_view_layout.cc
@@ -99,6 +99,20 @@ class BrowserViewLayout::WebContentsModalDialogHostViews
     return gfx::Point(middle_x - size.width() / 2, top_y);
   }
 
+  virtual gfx::Size GetMaximumDialogSize() OVERRIDE {
+    gfx::Rect content_area =
+        browser_view_layout_->contents_container_->ConvertRectToWidget(
+            browser_view_layout_->contents_container_->GetLocalBounds());
+
+    gfx::Size max_dialog_size = content_area.size();
+    // Adjust for difference in alignment between the dialog top and the top of
+    // the content area.
+    int height_offset = content_area.y() -
+        browser_view_layout_->web_contents_modal_dialog_top_y_;
+    max_dialog_size.Enlarge(0, height_offset);
+    return max_dialog_size;
+  }
+
   // Add/remove observer.
   virtual void AddObserver(
       WebContentsModalDialogHostObserver* observer) OVERRIDE {