Created min size for print preview dialog and modified to allow the

chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.cc

Index: chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.cc
diff --git a/chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.cc b/chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.cc
index d24da343196d36d7db8b7f84b3c244a14b088f91..1b2d51538d73a1ed982d42f67646c250be59b988 100644
--- a/chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.cc
+++ b/chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.cc
@@ -70,8 +70,27 @@ class AutoResizingTestWebDialogDelegate
 
   // Dialog delegates for auto-resizing dialogs are expected not to set |size|.
   void GetDialogSize(gfx::Size* size) const override {}
+
+  ui::ModalType GetDialogModalType() const override {
+    return ui::MODAL_TYPE_CHILD;
+  }
 };
 
+class ChildModalTestWebDialogDelegate
+    : public ui::test::TestWebDialogDelegate {
+ public:
+  explicit ChildModalTestWebDialogDelegate(const GURL& url)
+      : TestWebDialogDelegate(url) {}
+  ~ChildModalTestWebDialogDelegate() override {}
+
+  // Dialog is child modal
+  ui::ModalType GetDialogModalType() const override {
+    return ui::MODAL_TYPE_CHILD;
+  }
+
+};
+
+
 }  // namespace
 
 class ConstrainedWebDialogBrowserTest : public InProcessBrowserTest {
@@ -107,7 +126,7 @@ class ConstrainedWebDialogBrowserTest : public InProcessBrowserTest {
 // Tests that opening/closing the constrained window won't crash it.
 IN_PROC_BROWSER_TEST_F(ConstrainedWebDialogBrowserTest, BasicTest) {
   // The delegate deletes itself.
-  WebDialogDelegate* delegate = new ui::test::TestWebDialogDelegate(
+  WebDialogDelegate* delegate = new ChildModalTestWebDialogDelegate(
       GURL(chrome::kChromeUIConstrainedHTMLTestURL));
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
@@ -124,7 +143,7 @@ IN_PROC_BROWSER_TEST_F(ConstrainedWebDialogBrowserTest, BasicTest) {
 IN_PROC_BROWSER_TEST_F(ConstrainedWebDialogBrowserTest,
                        ReleaseWebContentsOnDialogClose) {
   // The delegate deletes itself.
-  WebDialogDelegate* delegate = new ui::test::TestWebDialogDelegate(
+  WebDialogDelegate* delegate = new ChildModalTestWebDialogDelegate(
       GURL(chrome::kChromeUIConstrainedHTMLTestURL));
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
@@ -237,7 +256,7 @@ IN_PROC_BROWSER_TEST_F(ConstrainedWebDialogBrowserTest,
                        ContentResizeInNonAutoResizingDialog) {
   // The delegate deletes itself.
   WebDialogDelegate* delegate =
-      new ui::test::TestWebDialogDelegate(GURL(kTestDataURL));
+      new ChildModalTestWebDialogDelegate(GURL(kTestDataURL));
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   ASSERT_TRUE(web_contents);