Bug 1452941 [wpt PR 8422] - Adjust XMLHttpRequest Content-Type handli…

…ng, a=testonly

Automatic update from web-platform-testsAdjust XMLHttpRequest Content-Type handling

See whatwg/xhr#176 and whatwg/mimesniff#36.
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wpt-commits: 84e7972a0518fb57f39740143d4b63e79b14e9f4
wpt-pr: 8422

UltraBlame original commit: be93580d93e3b6e94946124f06c188bc8daac745

testing/web-platform/meta/MANIFEST.json

@@ -3307803,7 +3307803,7 @@ html
 :
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-1e116cfb42e4e52fd714ec07c5bce6b9d5dceeda
+ea344025ce1b4da7d1a98e4900de1a290411ba3c
 "
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 testharness
@@ -3307827,7 +3307827,7 @@ html
 :
 [
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-7e193d5e25424699652e64b419e1d1384370e3a4
+15ad8424f678761d0e48b1924fb0baa7a718cbca
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 testharness
@@ -3853239,7 +3853239,7 @@ idl
 :
 [
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-65a8a0ef05cce0b09bf685dedab3540a7593f5a4
+3a1097a8c4cb4f63da97e126fbb302a5fec73968
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 support
@@ -4093873,7 +4093873,7 @@ js
 :
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-d43568b85e47f0284d1084134e043cb04e67d948
+5493ea79d860016c252fb67d6c7d7f17258deb1d
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 support
@@ -4093901,7 +4093901,7 @@ js
 :
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-d5ccae3dd857f15eab45de2e70b332aaa126a575
+9f6d5f18913c02044cc06c300b924f387025c258
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 support
@@ -4094495,7 +4094495,7 @@ html
 :
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-e0d4ba4c0f1a5da4d126c501eca733e00adbef1a
+fc183c88c463e08880cc0ed381474ee69d6e5056
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 testharness
@@ -4149726,7 +4149726,7 @@ htm
 :
 [
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-e143738f086c6c96de54539e799ee194de436246
+a1ce069d23a54ea7b60c3eaa1ff943651e7d9302
 "
 "
 testharness