Revert "Use Canvastext for initial color instead of hardcoded values."

This reverts commit fbe0892e.

Without the ForcedColors Blink runtime feature enabled, using Canvastext
resulted in a white text on white background default rendering on
Windows when high contrast mode was enabled in the OS.

Should be re-landed when the ForcedColors feature is enabled by default.

Bug: 1067481
Change-Id: I41a18fc1e406151085930e0953046caf5f4d9b25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139722Reviewed-by: Alison Maher <almaher@microsoft.com>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757140}

third_party/blink/renderer/core/css/css_properties.json5

@@ -645,8 +645,8 @@
       inherited: true,
       field_group: "inherited",
       field_template: "external",
-      include_paths: ["third_party/blink/renderer/core/layout/layout_theme.h"],
-      default_value: "LayoutTheme::GetTheme().SystemColor(CSSValueID::kCanvastext, WebColorScheme::kLight)",
+      include_paths: ["third_party/blink/renderer/platform/graphics/color.h"],
+      default_value: "Color::kBlack",
       type_name: "Color",
       computed_style_custom_functions: ["getter", "setter"],
       style_builder_custom_functions: ["initial", "inherit", "value"],
@@ -5432,8 +5432,8 @@
       inherited: true,
       field_group: "inherited",
       field_template: "external",
-      include_paths: ["third_party/blink/renderer/core/layout/layout_theme.h"],
-      default_value: "LayoutTheme::GetTheme().SystemColor(CSSValueID::kCanvastext, WebColorScheme::kLight)",
+      include_paths: ["third_party/blink/renderer/platform/graphics/color.h"],
+      default_value: "Color::kBlack",
       type_name: "Color",
       computed_style_custom_functions: ["getter", "setter"],
       style_builder_custom_functions: ["initial", "inherit", "value"],

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

@@ -1238,10 +1238,6 @@ scoped_refptr<ComputedStyle> StyleResolver::InitialStyleForElement(
                                                        : 1);
   initial_style->SetEffectiveZoom(initial_style->Zoom());
 
-  initial_style->SetInternalVisitedColor(
-      initial_style->InitialColorForColorScheme());
-  initial_style->SetColor(initial_style->InitialColorForColorScheme());
-
   FontDescription document_font_description =
       initial_style->GetFontDescription();
   document_font_description.SetLocale(
@@ -2331,6 +2327,8 @@ void StyleResolver::ApplyCascadedColorValue(StyleResolverState& state) {
       state.Style()->SetColor(
           StyleBuilderConverter::ConvertColor(state, *color_value));
     }
+  } else if (state.GetElement() == GetDocument().documentElement()) {
+    state.Style()->SetColor(state.Style()->InitialColorForColorScheme());
   }
 
   if (const CSSValue* visited_color_value =

third_party/blink/renderer/core/style/computed_style.h

@@ -2579,8 +2579,7 @@ class ComputedStyle : public ComputedStyleBase,
     // property should be canvastext, but since we do not yet ship color-scheme
     // aware system colors, we use this method instead. This should be replaced
     // by default_value:"canvastext" in css_properties.json5.
-    return LayoutTheme::GetTheme().SystemColor(
-        CSSValueID::kCanvastext, UsedColorSchemeForInitialColors());
+    return DarkColorScheme() ? Color::kWhite : Color::kBlack;
   }
 
   Color ForcedBackplateColor() const {