MacViews: Fix inconsistencies with window modal dialog parent types.

On Aura, both gfx::NativeView and gfx::NativeWindow map to the same type
(aura::Window*).
On Mac, they map to different types (NSView* and NSWindow*) so they are not
interchangeable.

CreateBrowserModalDialogViews() is changed back to take a NativeWindow
parent because that is what the callers expect.
It was recently changed to NativeView in https://crrev.com/699553002.
Added platform_util::GetViewForWindow() to convert the parent to the
NativeView type that the Widget expects.

BUG=425229

Review URL: https://codereview.chromium.org/718913004

Cr-Commit-Position: refs/heads/master@{#304324}

1 files changed, 4 insertions, 1 deletions

diff --git a/athena/extensions/athena_constrained_window_views_client.cc b/athena/extensions/athena_constrained_window_views_client.cc
index d56503f..1645639 100644
--- a/athena/extensions/athena_constrained_window_views_client.cc
+++ b/athena/extensions/athena_constrained_window_views_client.cc
@@ -19,7 +19,7 @@
 namespace athena {
 namespace {
 
-// Provides the host envrionment for web modal dialogs. See
+// Provides the host environment for web modal dialogs. See
 // web_modal::WebContentsModalDialogHost, and ModalDialogHost for more
 // details.
 class ModalDialogHostImpl : public web_modal::WebContentsModalDialogHost,
@@ -121,6 +121,9 @@ class AthenaConstrainedWindowViewsClient
       return ModalDialogHostImpl::Get(parent);
     return nullptr;
   }
+  gfx::NativeView GetDialogHostView(gfx::NativeWindow parent) override {
+    return parent;
+  }
 
   DISALLOW_COPY_AND_ASSIGN(AthenaConstrainedWindowViewsClient);
 };