Bug 1188806: [MSE] Disable tests timing out intermittently. r=karlt

MSE with MP4 isn't enabled on linux, so those tests should always be failing.

testing/web-platform/meta/media-source/mediasource-config-change-mp4-av-framesize.html.ini

@@ -1,8 +1,6 @@
 [mediasource-config-change-mp4-av-framesize.html]
   type: testharness
   prefs: [media.mediasource.enabled:true]
-  [Tests mp4 frame size changes in multiplexed content.]
+  disabled:
-    expected:
+    if os == "linux": https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if os == "linux": FAIL
+    if (os == "win") and (version == "5.1.2600"): https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if (os == "win") and (version == "5.1.2600"): FAIL
-

testing/web-platform/meta/media-source/mediasource-config-change-mp4-av-video-bitrate.html.ini

@@ -1,6 +1,9 @@
 [mediasource-config-change-mp4-av-video-bitrate.html]
   type: testharness
   prefs: [media.mediasource.enabled:true]
+  disabled:
+    if os == "linux": https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
+    if (os == "win") and (version == "5.1.2600"): https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
   [Tests mp4 video bitrate changes in multiplexed content.]
     expected:
       if os == "linux": FAIL

testing/web-platform/meta/media-source/mediasource-config-change-mp4-v-bitrate.html.ini

@@ -1,8 +1,6 @@
 [mediasource-config-change-mp4-v-bitrate.html]
   type: testharness
   prefs: [media.mediasource.enabled:true]
-  [Tests mp4 video-only bitrate changes.]
+  disabled:
-    expected:
+    if os == "linux": https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if os == "linux": FAIL
+    if (os == "win") and (version == "5.1.2600"): https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if (os == "win") and (version == "5.1.2600"): FAIL
-

testing/web-platform/meta/media-source/mediasource-config-change-mp4-v-framerate.html.ini

@@ -1,8 +1,6 @@
 [mediasource-config-change-mp4-v-framerate.html]
   type: testharness
   prefs: [media.mediasource.enabled:true]
-  [Tests mp4 video-only frame rate changes.]
+  disabled:
-    expected:
+    if os == "linux": https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if os == "linux": FAIL
+    if (os == "win") and (version == "5.1.2600"): https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if (os == "win") and (version == "5.1.2600"): FAIL
-

testing/web-platform/meta/media-source/mediasource-config-change-mp4-v-framesize.html.ini

@@ -1,8 +1,6 @@
 [mediasource-config-change-mp4-v-framesize.html]
   type: testharness
   prefs: [media.mediasource.enabled:true]
-  [Tests mp4 video-only frame size changes.]
+  disabled:
-    expected:
+    if os == "linux": https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if os == "linux": FAIL
+    if (os == "win") and (version == "5.1.2600"): https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
-      if (os == "win") and (version == "5.1.2600"): FAIL
-