Revert "Disable 3 tests in encrypted_media_browsertest.cc"

This reverts commit c53bd714.

Reason for revert: Disabling is non-actionable, see crbug.com/1010061#c11

Original change's description:
> Disable 3 tests in encrypted_media_browsertest.cc
> 
> TBR=hbos@chromium.org
> NOTRY=true
> 
> Bug: 1010061
> Change-Id: Iac97955e581bfbe5091c7cab8ca453fdd63c1c7e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832693
> Reviewed-by: Xida Chen <xidachen@chromium.org>
> Commit-Queue: Xida Chen <xidachen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#701584}

TBR=hbos@chromium.org,xidachen@chromium.org

Change-Id: Ibf089b59ecebccdabe63c1169be9ca572f2f2301
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1010061
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835353Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701917}

content/browser/media/encrypted_media_browsertest.cc

@@ -206,8 +206,7 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_AudioClearVideo_WebM) {
   TestSimplePlayback("bear-320x240-av_enc-a.webm");
 }
 
-// crbug.com/1010061: disabled due to flakiness.
-IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, DISABLED_Playback_VideoAudio_WebM) {
+IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoAudio_WebM) {
   TestSimplePlayback("bear-320x240-av_enc-av.webm");
 }
 
@@ -227,9 +226,7 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_VideoClearAudio_WebM) {
   TestSimplePlayback("bear-320x240-av_enc-v.webm");
 }
 
-// crbug.com/1010061: disabled due to flakiness.
-IN_PROC_BROWSER_TEST_P(EncryptedMediaTest,
-                       DISABLED_Playback_AudioOnly_WebM_Opus) {
+IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_AudioOnly_WebM_Opus) {
 #if defined(OS_ANDROID)
   if (!media::MediaCodecUtil::IsOpusDecoderAvailable())
     return;
@@ -365,8 +362,7 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_Encryption_CENS) {
                       media::kError);
 }
 
-// crbug.com/1010061: disabled due to flakiness.
-IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, DISABLED_Playback_Encryption_CBCS) {
+IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, Playback_Encryption_CBCS) {
   std::string expected_result =
       BUILDFLAG(ENABLE_CBCS_ENCRYPTION_SCHEME) ? media::kEnded : media::kError;
   RunMultipleFileTest("bear-640x360-v_frag-cbcs.mp4",