Temporarily disabling WebRTC FF interop test.

chrome/browser/media/webrtc_apprtc_browsertest.cc

Index: chrome/browser/media/webrtc_apprtc_browsertest.cc
diff --git a/chrome/browser/media/webrtc_apprtc_browsertest.cc b/chrome/browser/media/webrtc_apprtc_browsertest.cc
index 4821d4e6d5d9d8eebaea39f5481d3632cbf3189d..0af80d4bd3ae4e3c68e5fb0fb125562679f3b189 100644
--- a/chrome/browser/media/webrtc_apprtc_browsertest.cc
+++ b/chrome/browser/media/webrtc_apprtc_browsertest.cc
@@ -270,7 +270,8 @@ IN_PROC_BROWSER_TEST_F(WebRtcApprtcBrowserTest, MANUAL_WorksOnApprtc) {
 }
 
 #if defined(OS_LINUX)
-#define MAYBE_MANUAL_FirefoxApprtcInteropTest MANUAL_FirefoxApprtcInteropTest
+// So-far unexplained breakage only on bots: http:/crbug.com/626556.
+#define MAYBE_MANUAL_FirefoxApprtcInteropTest DISABLED_MANUAL_FirefoxApprtcInteropTest
 #else
 // Not implemented yet on Windows and Mac.
 #define MAYBE_MANUAL_FirefoxApprtcInteropTest DISABLED_MANUAL_FirefoxApprtcInteropTest