Avoid an unnecessary float casting in StyleBuilderConverter

Bug: 994488
Change-Id: I7d40a2a5faa0e030057c12119c1f0b2762bd091e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761397Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688327}

third_party/blink/renderer/core/css/resolver/style_builder_converter.cc

@@ -982,11 +982,8 @@ float StyleBuilderConverter::ConvertBorderWidth(StyleResolverState& state,
     return 0;
   }
   const auto& primitive_value = To<CSSPrimitiveValue>(value);
-  double result =
-      primitive_value.ComputeLength<double>(state.CssToLengthConversionData());
-  return clampTo<float>(RoundForImpreciseConversion<float>(result),
-                        defaultMinimumForClamp<float>(),
-                        defaultMaximumForClamp<float>());
+  return primitive_value.ComputeLength<float>(
+      state.CssToLengthConversionData());
 }
 
 GapLength StyleBuilderConverter::ConvertGapLength(StyleResolverState& state,