Don't try RemoveTemporarySession test if license server not available.

BUG=894422
TEST=test passes on Windows

Change-Id: I3907fecda3642f542db153e68ce12cb33c074402
Reviewed-on: https://chromium-review.googlesource.com/c/1278467
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#599065}(cherry picked from commit 44229dd)
Reviewed-on: https://chromium-review.googlesource.com/c/1284389
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/branch-heads/3578@{#60}
Cr-Branched-From: 4226ddf-refs/heads/master@{#599034}

Author: jrummell-chromium

chrome/browser/media/encrypted_media_browsertest.cc

@@ -656,6 +656,12 @@ IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, PolicyCheck) {
 }
 
 IN_PROC_BROWSER_TEST_P(EncryptedMediaTest, RemoveTemporarySession) {
+  if (!IsPlayBackPossible(CurrentKeySystem())) {
+    DVLOG(0) << "Skipping test - RemoveTemporarySession test requires license "
+                "server.";
+    return;
+  }
+
   // Although this test doesn't play anything, there is no need to run it
   // twice for the same key system.
   if (CurrentSourceType() != SrcType::MSE) {