Bug 1900232: Part 4 - Add anchor-size() to margin properties. r=firefox-style-system-reviewers,emilio

Differential Revision: https://phabricator.services.mozilla.com/D222533

layout/generic/nsTextFrame.cpp

@@ -1876,7 +1876,7 @@ bool BuildTextRunsScanner::ContinueTextRunAcrossFrames(nsTextFrame* aFrame1,
         //
         // 1. Any of margin/border/padding separating the two typographic
         //    character units in the inline axis is non-zero.
-        const auto& margin = ctx->StyleMargin()->mMargin.Get(aSide);
+        const auto& margin = ctx->StyleMargin()->GetMargin(aSide);
         if (!margin.ConvertsToLength() ||
             margin.AsLengthPercentage().ToLength() != 0) {
           return true;