Update bug references for some failing SVG WPT tests

These tests fail because of lack of support for references to general
shapes from <textPath> and the 'side' attribute in <textPath>.
crbug.com/366559 is the bug for supporting thos features, so redirect to
it.

Tests:

  external/wpt/svg/shapes/reftests/pathlength-003.svg
  external/wpt/svg/text/reftests/textpath-side-001.svg
  external/wpt/svg/text/reftests/textpath-shape-001.svg

TBR=schenney@chromium.org
BUG=366559,863355

Change-Id: Ia2fc56704fafd3ace0af949fceeaf2799f960fe7
Reviewed-on: https://chromium-review.googlesource.com/1172298Reviewed-by: Fredrik Söderquist <fs@opera.com>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#582542}

third_party/WebKit/LayoutTests/TestExpectations

@@ -2764,9 +2764,9 @@ crbug.com/626703 external/wpt/css/css-text/white-space/textarea-break-spaces-001
 crbug.com/626703 external/wpt/css/css-text/white-space/textarea-break-spaces-003.html [ Failure ]
 crbug.com/626703 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-column-row-gap-003.html [ Failure ]
 crbug.com/626703 [ Mac ] external/wpt/svg/shapes/reftests/pathlength-002.svg [ Failure ]
-crbug.com/626703 external/wpt/svg/shapes/reftests/pathlength-003.svg [ Failure ]
-crbug.com/626703 external/wpt/svg/text/reftests/textpath-side-001.svg [ Failure ]
-crbug.com/626703 external/wpt/svg/text/reftests/textpath-shape-001.svg [ Failure ]
+crbug.com/366559 external/wpt/svg/shapes/reftests/pathlength-003.svg [ Failure ]
+crbug.com/366559 external/wpt/svg/text/reftests/textpath-side-001.svg [ Failure ]
+crbug.com/366559 external/wpt/svg/text/reftests/textpath-shape-001.svg [ Failure ]
 crbug.com/626703 [ Win7 ] external/wpt/resource-timing/resource_timing_buffer_full_eventually.html [ Timeout ]
 crbug.com/626703 external/wpt/svg/rendering/order/z-index.svg [ Failure ]
 crbug.com/626703 external/wpt/web-animations/timing-model/timelines/update-and-send-events.html [ Timeout ]