webrtc: update expected return values for catalina

As of r708260 on Catalina these methods return the
SYSTEM_PERMISSION_DENIED rather than PERMISSION_DENIED.

Bug: 998755
Change-Id: I8fa29f08a93ec1b4df5cfd15d2343154f1985f81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879774Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709152}

chrome/browser/media/webrtc/display_media_access_handler_unittest.cc

@@ -105,7 +105,7 @@ TEST_F(DisplayMediaAccessHandlerTest, PermissionGiven) {
   // Starting from macOS 10.15, screen capture requires system permissions
   // that are disabled by default.
   if (base::mac::IsAtLeastOS10_15()) {
-    EXPECT_EQ(blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
+    EXPECT_EQ(blink::mojom::MediaStreamRequestResult::SYSTEM_PERMISSION_DENIED,
               result);
     return;
   }
@@ -129,7 +129,7 @@ TEST_F(DisplayMediaAccessHandlerTest, PermissionGivenToRequestWithAudio) {
   // Starting from macOS 10.15, screen capture requires system permissions
   // that are disabled by default.
   if (base::mac::IsAtLeastOS10_15()) {
-    EXPECT_EQ(blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
+    EXPECT_EQ(blink::mojom::MediaStreamRequestResult::SYSTEM_PERMISSION_DENIED,
               result);
     return;
   }
@@ -260,7 +260,7 @@ TEST_F(DisplayMediaAccessHandlerTest, MultipleRequests) {
   // Starting from macOS 10.15, screen capture requires system permissions
   // that are disabled by default.
   if (base::mac::IsAtLeastOS10_15()) {
-    EXPECT_EQ(blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
+    EXPECT_EQ(blink::mojom::MediaStreamRequestResult::SYSTEM_PERMISSION_DENIED,
               result);
     access_handler_.reset();
     return;