update disabled test on Dr.Memory bots

- rename WebRtcBrowserTest.TwoCallsWithAecDump to WebRtcAecDumpBrowserTest.*CallWithAecDump*

TBR=phoglund@chromium.org
BUG=389132
NOTRY=true

Review URL: https://codereview.chromium.org/523123003

Cr-Commit-Position: refs/heads/master@{#292830}

tools/valgrind/gtest_exclude/content_browsertests.gtest-drmemory_win32.txt

 # crbug.com/389132
-WebRtcBrowserTest.TwoCallsWithAecDump
+WebRtcAecDumpBrowserTest.*CallWithAecDump*
 
 # http://code.google.com/p/drmemory/issues/detail?id=1528
 # Un-analyzed test failures:
@@ -42,4 +42,3 @@ WebRtcBrowserTest.CanSetupVideoCallWith16To9AspectRatio
 WebRtcBrowserTest.CanSetupVideoCallWith1To1AspectRatio
 WebRtcBrowserTest.CanSetupVideoCallWith4To3AspectRatio
 WebRtcBrowserTest.NegotiateOfferWithBLine
-WebRtcAecDumpBrowserTest.*CallWithAecDump*