Remove using directives ("using namespace x") from renderer/core/animation/.

Bug: 82078
Change-Id: Ic24ef9bcc5545ae06468a3c5a5912292ccb10988
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867814
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Majid Valipour <majidvp@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707467}

third_party/blink/renderer/core/animation/compositor_animations_test.cc

@@ -103,7 +103,7 @@ CSSPaintImageGenerator* ProvideOverrideGenerator(
 }
 }  // namespace
 
-using namespace css_test_helpers;
+using css_test_helpers::RegisterProperty;
 
 class AnimationCompositorAnimationsTest : public PaintTestConfigurations,
                                           public RenderingTest {

third_party/blink/renderer/core/animation/css_color_interpolation_type.cc

@@ -18,8 +18,6 @@
 
 namespace blink {
 
-using namespace cssvalue;
-
 enum InterpolableColorIndex : unsigned {
   kRed,
   kGreen,
@@ -88,7 +86,7 @@ CSSColorInterpolationType::CreateInterpolableColor(const StyleColor& color) {
 
 std::unique_ptr<InterpolableValue>
 CSSColorInterpolationType::MaybeCreateInterpolableColor(const CSSValue& value) {
-  if (auto* color_value = DynamicTo<CSSColorValue>(value))
+  if (auto* color_value = DynamicTo<cssvalue::CSSColorValue>(value))
     return CreateInterpolableColor(color_value->Value());
   auto* identifier_value = DynamicTo<CSSIdentifierValue>(value);
   if (!identifier_value)
@@ -296,7 +294,7 @@ const CSSValue* CSSColorInterpolationType::CreateCSSValue(
     const StyleResolverState& state) const {
   const InterpolableList& color_pair = ToInterpolableList(interpolable_value);
   Color color = ResolveInterpolableColor(*color_pair.Get(kUnvisited), state);
-  return CSSColorValue::Create(color.Rgb());
+  return cssvalue::CSSColorValue::Create(color.Rgb());
 }
 
 void CSSColorInterpolationType::Composite(