Replace use of std containers with WTF's equivalents in css_numeric_value_type.h

This CL replaces the use of std::array of std containers
with WTF::Vector in css_numeric_value_type.h.

Bug: 952716
Change-Id: I1c9b80963301d28d8b3d0be24f423e38cfb8e9a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694964Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#676185}

third_party/blink/renderer/core/css/cssom/css_numeric_value_type.cc

@@ -86,12 +86,14 @@ AtomicString CSSNumericValueType::BaseTypeToString(BaseType base_type) {
 }
 
 CSSNumericValueType::CSSNumericValueType(CSSPrimitiveValue::UnitType unit) {
+  exponents_.Fill(0, kNumBaseTypes);
   if (unit != CSSPrimitiveValue::UnitType::kNumber)
     SetExponent(UnitTypeToBaseType(unit), 1);
 }
 
 CSSNumericValueType::CSSNumericValueType(int exponent,
                                          CSSPrimitiveValue::UnitType unit) {
+  exponents_.Fill(0, kNumBaseTypes);
   if (unit != CSSPrimitiveValue::UnitType::kNumber)
     SetExponent(UnitTypeToBaseType(unit), exponent);
 }

third_party/blink/renderer/core/css/cssom/css_numeric_value_type.h

@@ -7,8 +7,6 @@
 
 #include "third_party/blink/renderer/core/css/css_primitive_value.h"
 
-#include <array>
-
 namespace blink {
 
 // Represents the type of a CSSNumericValue, which is a map of base types to
@@ -93,7 +91,7 @@ class CORE_EXPORT CSSNumericValueType {
     return num_non_zero_entries_ == 1 && Exponent(base_type) == value;
   }
 
-  std::array<int, kNumBaseTypes> exponents_{};  // zero-initialize
+  Vector<int, kNumBaseTypes> exponents_;
   BaseType percent_hint_ = BaseType::kPercent;
   bool has_percent_hint_ = false;
   unsigned num_non_zero_entries_ = 0;