Move datetimelocal-picker test from flaky-timeout to Slow tests

This test takes almost the full 6s (or longer depending on the build)
timeout available. It recently started causing flaky CQ retries, so
I'm moving it to SlowTests. If it continues hitting the timeout, it
likely needs more direct intervention (fixing the test).

Fixed: 1145716
Change-Id: I160b3a8192e43fd53f4552d484313fb63b9792cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529571
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825880}

third_party/blink/web_tests/SlowTests

@@ -531,18 +531,14 @@ crbug.com/1091716 svg/as-object/sizing/svg-in-object-placeholder-percentage-perc
 
 crbug.com/1043669 [ Mac ] inspector-protocol/emulation/set-vision-deficiency.js [ Slow ]
 crbug.com/1092121 fast/css/large-list-of-rules-crash.html [ Slow ]
-
 crbug.com/1042205 virtual/off-main-thread-css-paint/external/wpt/css/css-paint-api/paint2d-filter.https.html [ Slow ]
-
 crbug.com/1093849 external/wpt/dom/nodes/Element-classlist.html [ Slow ]
 crbug.com/1093853 external/wpt/dom/ranges/Range-surroundContents.html [ Slow ]
-
 crbug.com/1104091 [ Linux ] webcodecs/videoframe-imagebitmap.html [ Slow ]
 crbug.com/1093478 external/wpt/quirks/unitless-length/limited-quirks.html [ Slow ]
-
 crbug.com/1133836 external/wpt/scroll-to-text-fragment/redirects.html [ Slow ]
-
 crbug.com/1134580 virtual/eye-dropper/color-picker-show-eye-dropper.html [ Slow ]
+crbug.com/1145716 fast/forms/calendar-picker/datetimelocal-picker-open-to-focused-field.html [ Slow ]
 
 # These began to hit timeouts when moving from Windows-10-15063 to Windows-10-18363
 crbug.com/1142023 [ Win10 ] external/wpt/web-animations/animation-model/animation-types/accumulation-per-property-002.html [ Slow ]

third_party/blink/web_tests/TestExpectations

@@ -6240,7 +6240,6 @@ crbug.com/1145424 [ Win ] http/tests/devtools/sources/debugger-ui/reveal-executi
 crbug.com/1145641 external/wpt/requestidlecallback/callback-invoked.html [ Pass Timeout ]
 crbug.com/1046784 http/tests/devtools/sources/debugger-ui/debugger-inline-values-frames.js [ Pass Timeout ]
 crbug.com/1145742 [ Fuchsia ] virtual/stable/http/tests/navigation/location-assign-adds-history-item.html [ Pass Crash Timeout ]
-crbug.com/1145716 fast/forms/calendar-picker/datetimelocal-picker-open-to-focused-field.html [ Pass Timeout ]
 
 # Sheriff 2020-11-05
 crbug.com/1146221 [ Linux ] http/tests/devtools/sources/debugger-ui/debugger-inline-values.js [ Pass Timeout ]