Reenable flaky EncryptedMediaTest for investigation

These tests were flaky and disabled. But we have not been able to repro
the issue locally, nor understand the root cause of the issue.

Part of the problem is that the top part of the test log is truncated,
which has been fixed in a previous CL. Now we need to reproduce the test
failure to be able to examine the logs for investigation.

This CL reenables those flaky tests by reverting two CLs that disabled
those tests:

This reverts commit 9f4bee97.
Revert "Disable ECKEncryptedMediaTest.Renewal on linux asan"

This reverts commit b023b4e8.
Revert "Disable EncryptedMediaTest.Playback_VideoClearAudio_WebM on Linux asan"

TBR=jrummell@chromium.org,cfroussios@chromium.org
BUG=793426

Change-Id: I7441ccf1d89ea81d396ba0ab84a77eb41c9bf700
Reviewed-on: https://chromium-review.googlesource.com/823572Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523688}

chrome/browser/media/encrypted_media_browsertest.cc

@@ -581,15 +581,7 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoAudio_WebM) {
   TestSimplePlayback("bear-320x240-av_enc-av.webm", kWebMVorbisAudioVP8Video);
 }
 
-// TODO(crbug.com/794102) Fix flakiness
-#if defined(OS_LINUX) && defined(ADDRESS_SANITIZER)
-#define MAYBE_Playback_VideoClearAudio_WebM \
-  DISABLED_Playback_VideoClearAudio_WebM
-#else
-#define MAYBE_Playback_VideoClearAudio_WebM Playback_VideoClearAudio_WebM
-#endif
-IN_PROC_BROWSER_TEST_P(EncryptedMediaTest,
-                       MAYBE_Playback_VideoClearAudio_WebM) {
+IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoClearAudio_WebM) {
   TestSimplePlayback("bear-320x240-av_enc-v.webm", kWebMVorbisAudioVP8Video);
 }
 
@@ -798,13 +790,7 @@ IN_PROC_BROWSER_TEST_P(ECKEncryptedMediaTest, PlatformVerificationTest) {
                        kUnitTestSuccess);
 }
 
-// TODO(crbug.com/794039) Test is flaky on linux asan.
-#if defined(OS_LINUX) && defined(ADDRESS_SANITIZER)
-#define MAYBE_Renewal DISABLED_Renewal
-#else
-#define MAYBE_Renewal Renewal
-#endif
-IN_PROC_BROWSER_TEST_P(ECKEncryptedMediaTest, MAYBE_Renewal) {
+IN_PROC_BROWSER_TEST_P(ECKEncryptedMediaTest, Renewal) {
   TestPlaybackCase(kExternalClearKeyRenewalKeySystem, kNoSessionToLoad,
                    media::kEnded);