Use :fullscreen instead of :-webkit-full-screen.

The selectors matching for those pseudo classes are the same. No need to
use the legacy one internally.

Change-Id: I7a4f6d25e6e016a2af95e863948fda63cfa6d6fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800182Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695990}

third_party/blink/renderer/core/css/fullscreen.css

-:not(:root):-webkit-full-screen {
+:not(:root):fullscreen {
     position: fixed !important;
     top: 0 !important;
     right: 0 !important;
@@ -18,14 +18,14 @@
     object-fit: contain;
 }
 
-iframe:-webkit-full-screen {
+iframe:fullscreen {
     border: none !important;
     padding: 0 !important;
 }
 
 /* TODO(foolip): In the spec, there's a ::backdrop block with the properties
    shared with dialog::backdrop (see html.css). */
-:not(:root):-webkit-full-screen::backdrop {
+:not(:root):fullscreen::backdrop {
     position: fixed;
     top: 0;
     right: 0;
@@ -45,7 +45,7 @@ iframe:-webkit-full-screen {
     overflow: hidden !important;
 }
 
-:-webkit-full-screen:-internal-video-persistent-ancestor :not(:-internal-video-persistent-ancestor) {
+:fullscreen:-internal-video-persistent-ancestor :not(:-internal-video-persistent-ancestor) {
   display: none !important;
 }
 

third_party/blink/renderer/core/css/fullscreenAndroid.css

-video:-webkit-full-screen {
+video:fullscreen {
   /* Fullscreen video on Android does not synchronize correctly when the <video>
    * element is not rendered in the root render pass. Disable properties that
    * cause this. (http://crbug.com/618753) */

third_party/blink/renderer/core/exported/web_remote_frame_impl.cc

@@ -391,7 +391,7 @@ void WebRemoteFrameImpl::WillEnterFullscreen() {
   // PrefixedForCrossProcessDescendant is necessary because:
   //  - The fullscreen element ready check and other checks should be bypassed.
   //  - |ownerElement| will need :-webkit-full-screen-ancestor style in addition
-  //    to :-webkit-full-screen.
+  //    to :fullscreen.
   //
   // TODO(alexmos): currently, this assumes prefixed requests, but in the
   // future, this should plumb in information about which request type

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

@@ -194,7 +194,7 @@ TEST_F(HTMLVideoElementPersistentTest, internalPseudoClassOnlyUAStyleSheet) {
 
   DummyExceptionStateForTesting exception_state;
 
-  EXPECT_FALSE(DivElement()->matches(":-webkit-full-screen"));
+  EXPECT_FALSE(DivElement()->matches(":fullscreen"));
   EXPECT_FALSE(DivElement()->matches(":-internal-video-persistent-ancestor",
                                      exception_state));
   EXPECT_TRUE(exception_state.HadException());
@@ -220,7 +220,7 @@ TEST_F(HTMLVideoElementPersistentTest, internalPseudoClassOnlyUAStyleSheet) {
   EXPECT_TRUE(VideoElement()->ContainsPersistentVideo());
 
   // The :internal-* rules apply only from the UA stylesheet.
-  EXPECT_TRUE(DivElement()->matches(":-webkit-full-screen"));
+  EXPECT_TRUE(DivElement()->matches(":fullscreen"));
   EXPECT_FALSE(DivElement()->matches(":-internal-video-persistent-ancestor",
                                      exception_state));
   EXPECT_TRUE(exception_state.HadException());

third_party/blink/renderer/core/testing/data/fullscreen_style.html

@@ -10,7 +10,7 @@
         margin: 0px;
       }
 
-      body:-webkit-full-screen-ancestor > :not(:-webkit-full-screen-ancestor):not(:-webkit-full-screen) {
+      body:-webkit-full-screen-ancestor > :not(:-webkit-full-screen-ancestor):not(:fullscreen) {
         display: none!important
       }