Re-enable WebRtc CaptureFromMediaElement tests

These were disabled across the board due to TSAN failures. They were
also previously disabled specifically in low-end Android test
environments.

The low-end test bot that originally produced failures is no more. The
TSAN failures also appear to be gone according to local testing.

This attempts to turn the tests back on so we can see what happens.

Bug: 626299,769903
Change-Id: Id75acf5948e45b72c714af31af74507987f2078f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119110
Auto-Submit: Ken Rockot <rockot@google.com>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753142}

content/browser/webrtc/webrtc_capture_from_element_browsertest.cc

@@ -23,8 +23,7 @@
 // process and hence does not support capture: https://crbug.com/641559.
 #define MAYBE_CaptureFromMediaElement DISABLED_CaptureFromMediaElement
 #else
-// crbug.com/769903: Disabling due to TSAN error.
-#define MAYBE_CaptureFromMediaElement DISABLED_CaptureFromMediaElement
+#define MAYBE_CaptureFromMediaElement CaptureFromMediaElement
 #endif
 
 namespace {
@@ -125,16 +124,6 @@ IN_PROC_BROWSER_TEST_F(WebRtcCaptureFromElementBrowserTest,
 
 IN_PROC_BROWSER_TEST_P(WebRtcCaptureFromElementBrowserTest,
                        MAYBE_CaptureFromMediaElement) {
-#if defined(OS_ANDROID)
-  // TODO(mcasas): flaky on Lollipop Low-End devices, investigate and reconnect
-  // https://crbug.com/626299
-  if (base::SysInfo::IsLowEndDevice() &&
-      base::android::BuildInfo::GetInstance()->sdk_int() <
-          base::android::SDK_VERSION_MARSHMALLOW) {
-    return;
-  }
-#endif
-
   MakeTypicalCall(JsReplace("testCaptureFromMediaElement($1, $2, $3, $4)",
                             GetParam().filename, GetParam().has_video,
                             GetParam().has_audio, GetParam().use_audio_tag),