fix: remove InspectableWebContentsViewMac (#43096)

* fix: remove InspectableWebContentsViewMac (#43033)

* Revert "refactor: remove InspectableWebContentsViewMac in favor of the Views version (#41326)"

This reverts commit e67ab9a93d.

* build: fix gn check

* chore: implement setCornerRadii in inspectable_web_contents_view_mac

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: pass in cornerRadii value in setCornerRadii

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: forward declaration

* 5578714: Remove 0-arg (default) constructor for views::Widget::InitParams.

5578714

* fix: contents_web_view_ -> contents_view_

* chore: remove extraneous includes

---------

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: remove custom border radius feat (#42320)

* fix: fix views::Widget::InitParams params

---------

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

shell/browser/ui/cocoa/electron_ns_window.mm

@@ -200,11 +200,6 @@ void SwizzleSwipeWithEvent(NSView* view, SEL swiz_selector) {
 }
 
 - (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen*)screen {
-  // We initialize the window in headless mode to allow painting before it is
-  // shown, but we don't want the headless behavior of allowing the window to be
-  // placed unconstrained.
-  self.isHeadless = false;
-
   // Resizing is disabled.
   if (electron::ScopedDisableResize::IsResizeDisabled())
     return [self frame];