Aura content shell: make the window shrinkable.

content/shell/browser/shell_views.cc

Index: content/shell/browser/shell_views.cc
diff --git a/content/shell/browser/shell_views.cc b/content/shell/browser/shell_views.cc
index c6b09e474a704e024ee2dbbdf3c320227a329d25..1670f87e8c5c10e3d74ee0aa2c14cbc3227d2521 100644
--- a/content/shell/browser/shell_views.cc
+++ b/content/shell/browser/shell_views.cc
@@ -270,6 +270,11 @@ class ShellWindowDelegateView : public views::WidgetDelegateView,
   virtual View* GetContentsView() OVERRIDE { return this; }
 
   // Overridden from View
+  virtual gfx::Size GetMinimumSize() OVERRIDE {
+    // We want to be able to make the window smaller than its initial
+    // (preferred) size.
+    return gfx::Size();
+  }
   virtual void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) OVERRIDE {
     if (details.is_add && details.child == this) {