Revert "media: Makes fake video support 30 fps"

This reverts commit 9ecbfdde.

Reason for revert: <INSERT REASONING HERE>
fast/peerconnection/RTCPeerConnection-applyConstraints-remoteVideoTrack.html is flaky on Builder Mac10.10 Tests
https://ci.chromium.org/p/chromium/builders/ci/Mac10.10%20Tests


Original change's description:
> media: Makes fake video support 30 fps
> 
> Bug: b/150004607
> Test: capture_unittests
> 
> Change-Id: I2fd99575cb8a9b780946679ded96c10d94334370
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063617
> Commit-Queue: Guido Urdaneta <guidou@chromium.org>
> Auto-Submit: Wei Lee <wtlee@chromium.org>
> Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#743661}

TBR=guidou@chromium.org,wtlee@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/150004607
Change-Id: I1221bc67ba695faa6313a939b8e8f1f7a6ea527c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2069846Reviewed-by: Lan Wei <lanwei@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743874}

media/capture/video/fake_video_capture_device_factory.cc

@@ -32,7 +32,7 @@ static const media::FakeVideoCaptureDevice::DeliveryMode kDefaultDeliveryMode =
 static constexpr std::array<gfx::Size, 6> kDefaultResolutions{
     {gfx::Size(96, 96), gfx::Size(320, 240), gfx::Size(640, 480),
      gfx::Size(1280, 720), gfx::Size(1920, 1080), gfx::Size(3840, 2160)}};
-static constexpr std::array<float, 1> kDefaultFrameRates{{30.0f}};
+static constexpr std::array<float, 1> kDefaultFrameRates{{20.0f}};
 
 static const double kInitialPan = 100.0;
 static const double kInitialTilt = 100.0;

media/capture/video/fake_video_capture_device_unittest.cc

@@ -209,27 +209,27 @@ TEST_F(FakeVideoCaptureDeviceTest, GetDeviceSupportedFormats) {
     EXPECT_EQ(96, supported_formats[0].frame_size.width());
     EXPECT_EQ(96, supported_formats[0].frame_size.height());
     EXPECT_EQ(expected_format, supported_formats[0].pixel_format);
-    EXPECT_GE(supported_formats[0].frame_rate, 30.0);
+    EXPECT_GE(supported_formats[0].frame_rate, 20.0);
     EXPECT_EQ(320, supported_formats[1].frame_size.width());
     EXPECT_EQ(240, supported_formats[1].frame_size.height());
     EXPECT_EQ(expected_format, supported_formats[1].pixel_format);
-    EXPECT_GE(supported_formats[1].frame_rate, 30.0);
+    EXPECT_GE(supported_formats[1].frame_rate, 20.0);
     EXPECT_EQ(640, supported_formats[2].frame_size.width());
     EXPECT_EQ(480, supported_formats[2].frame_size.height());
     EXPECT_EQ(expected_format, supported_formats[2].pixel_format);
-    EXPECT_GE(supported_formats[2].frame_rate, 30.0);
+    EXPECT_GE(supported_formats[2].frame_rate, 20.0);
     EXPECT_EQ(1280, supported_formats[3].frame_size.width());
     EXPECT_EQ(720, supported_formats[3].frame_size.height());
     EXPECT_EQ(expected_format, supported_formats[3].pixel_format);
-    EXPECT_GE(supported_formats[3].frame_rate, 30.0);
+    EXPECT_GE(supported_formats[3].frame_rate, 20.0);
     EXPECT_EQ(1920, supported_formats[4].frame_size.width());
     EXPECT_EQ(1080, supported_formats[4].frame_size.height());
     EXPECT_EQ(expected_format, supported_formats[4].pixel_format);
-    EXPECT_GE(supported_formats[4].frame_rate, 30.0);
+    EXPECT_GE(supported_formats[4].frame_rate, 20.0);
     EXPECT_EQ(3840, supported_formats[5].frame_size.width());
     EXPECT_EQ(2160, supported_formats[5].frame_size.height());
     EXPECT_EQ(expected_format, supported_formats[5].pixel_format);
-    EXPECT_GE(supported_formats[5].frame_rate, 30.0);
+    EXPECT_GE(supported_formats[5].frame_rate, 20.0);
     device_index++;
   }
 }
@@ -508,24 +508,24 @@ INSTANTIATE_TEST_SUITE_P(
                                FakeVideoCaptureDevice::DisplayMediaType::ANY,
                                {PIXEL_FORMAT_I420}},
            CommandLineTestData{"device-count=4",
-                               30,
+                               20,
                                4u,
                                FakeVideoCaptureDevice::DisplayMediaType::ANY,
                                {PIXEL_FORMAT_I420, PIXEL_FORMAT_Y16,
                                 PIXEL_FORMAT_MJPEG, PIXEL_FORMAT_I420}},
            CommandLineTestData{"device-count=4,ownership=client",
-                               30,
+                               20,
                                4u,
                                FakeVideoCaptureDevice::DisplayMediaType::ANY,
                                {PIXEL_FORMAT_I420, PIXEL_FORMAT_Y16,
                                 PIXEL_FORMAT_MJPEG, PIXEL_FORMAT_I420}},
            CommandLineTestData{"device-count=0",
-                               30,
+                               20,
                                0u,
                                FakeVideoCaptureDevice::DisplayMediaType::ANY,
                                {PIXEL_FORMAT_I420}},
            CommandLineTestData{"display-media-type=window",
-                               30,
+                               20,
                                1u,
                                FakeVideoCaptureDevice::DisplayMediaType::WINDOW,
                                {PIXEL_FORMAT_I420}},

third_party/blink/web_tests/fast/peerconnection/RTCPeerConnection-applyConstraints-remoteVideoTrack.html

@@ -8,7 +8,7 @@
 <body>
 <script>
 
-const FRAME_RATE_ERROR = 1.0;
+const FRAME_RATE_ERROR = 0.5;
 const SETTINGS_CHANGE_RATE = 0.8;
 
 promise_test(async t => {