Enable Unprefixed Fullscreen API by default.

Approved Intent to Ship:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/ODzbWn-xRrQ/dhkJzD8-CgAJ

BUG=383813

Change-Id: Ia0b1e681520728c290ce7e1f95388bc27ebf91d0
Reviewed-on: https://chromium-review.googlesource.com/1204595
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589185}

third_party/WebKit/LayoutTests/virtual/stable/webexposed/element-instance-property-listing-expected.txt

@@ -142,6 +142,8 @@ namespace http://www.w3.org/1999/xhtml
     property onended
     property onerror
     property onfocus
+    property onfullscreenchange
+    property onfullscreenerror
     property ongotpointercapture
     property oninput
     property oninvalid
@@ -217,6 +219,7 @@ namespace http://www.w3.org/1999/xhtml
     property removeEventListener
     property replaceChild
     property replaceWith
+    property requestFullscreen
     property requestPointerLock
     property scroll
     property scrollBy
@@ -1225,6 +1228,8 @@ namespace http://www.w3.org/2000/svg
     property onended
     property onerror
     property onfocus
+    property onfullscreenchange
+    property onfullscreenerror
     property ongotpointercapture
     property oninput
     property oninvalid
@@ -1300,6 +1305,7 @@ namespace http://www.w3.org/2000/svg
     property removeEventListener
     property replaceChild
     property replaceWith
+    property requestFullscreen
     property requestPointerLock
     property scroll
     property scrollBy

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt

@@ -1174,6 +1174,9 @@ interface Document : Node
     getter firstElementChild
     getter fonts
     getter forms
+    getter fullscreen
+    getter fullscreenElement
+    getter fullscreenEnabled
     getter head
     getter hidden
     getter images
@@ -1213,6 +1216,8 @@ interface Document : Node
     getter onerror
     getter onfocus
     getter onfreeze
+    getter onfullscreenchange
+    getter onfullscreenerror
     getter ongotpointercapture
     getter oninput
     getter oninvalid
@@ -1324,6 +1329,7 @@ interface Document : Node
     method elementsFromPoint
     method evaluate
     method execCommand
+    method exitFullscreen
     method exitPictureInPicture
     method exitPointerLock
     method getElementById
@@ -1357,6 +1363,9 @@ interface Document : Node
     setter dir
     setter domain
     setter fgColor
+    setter fullscreen
+    setter fullscreenElement
+    setter fullscreenEnabled
     setter linkColor
     setter onabort
     setter onauxclick
@@ -1388,6 +1397,8 @@ interface Document : Node
     setter onerror
     setter onfocus
     setter onfreeze
+    setter onfullscreenchange
+    setter onfullscreenerror
     setter ongotpointercapture
     setter oninput
     setter oninvalid
@@ -1516,6 +1527,8 @@ interface Element : Node
     getter onbeforepaste
     getter oncopy
     getter oncut
+    getter onfullscreenchange
+    getter onfullscreenerror
     getter onpaste
     getter onsearch
     getter onselectstart
@@ -1568,6 +1581,7 @@ interface Element : Node
     method removeAttributeNS
     method removeAttributeNode
     method replaceWith
+    method requestFullscreen
     method requestPointerLock
     method scroll
     method scrollBy
@@ -1592,6 +1606,8 @@ interface Element : Node
     setter onbeforepaste
     setter oncopy
     setter oncut
+    setter onfullscreenchange
+    setter onfullscreenerror
     setter onpaste
     setter onsearch
     setter onselectstart
@@ -6261,6 +6277,7 @@ interface ShadowRoot : DocumentFragment
     attribute @@toStringTag
     getter activeElement
     getter delegatesFocus
+    getter fullscreenElement
     getter host
     getter innerHTML
     getter mode
@@ -6271,6 +6288,7 @@ interface ShadowRoot : DocumentFragment
     method elementFromPoint
     method elementsFromPoint
     method getSelection
+    setter fullscreenElement
     setter innerHTML
 interface SharedWorker : EventTarget
     attribute @@toStringTag

third_party/blink/renderer/core/fullscreen/element_fullscreen.cc

@@ -18,7 +18,9 @@ ScriptPromise ElementFullscreen::requestFullscreen(
 }
 
 void ElementFullscreen::webkitRequestFullscreen(Element& element) {
-  webkitRequestFullscreen(element, FullscreenOptions());
+  FullscreenOptions options;
+  options.setNavigationUI("hide");
+  webkitRequestFullscreen(element, options);
 }
 
 void ElementFullscreen::webkitRequestFullscreen(

third_party/blink/renderer/core/html/media/html_video_element.cc

@@ -459,7 +459,9 @@ bool HTMLVideoElement::HasAvailableVideoFrame() const {
 
 void HTMLVideoElement::webkitEnterFullscreen() {
   if (!IsFullscreen()) {
-    Fullscreen::RequestFullscreen(*this, FullscreenOptions(),
+    FullscreenOptions options;
+    options.setNavigationUI("hide");
+    Fullscreen::RequestFullscreen(*this, options,
                                   Fullscreen::RequestType::kPrefixed);
   }
 }

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -511,12 +511,12 @@
     },
     {
       name: "FullscreenOptions",
-      status: "experimental",
+      status: "stable",
     },
     {
       name: "FullscreenUnprefixed",
       settable_from_internals: true,
-      status: "experimental",
+      status: "stable",
     },
     {
       name: "GamepadButtonAxisEvents",