Remove DeprecatedEqualIgnoringCase in renderer/core/html

This CL migrates the remaining comparisons involving an ASCII literal
from DeprecatedEqualIgnoringCase to EqualIgnoringASCIICase.

In case of SanitizeValue() in "color_input_type.cc",
Only ASCII (#0-9) and (A-F) characters are involved (not S or K)
in the right hand side, this is effectively not a behavior change.

Also this changes are potentially author-facing, but We’ve optimistically
made them without any additional tests based on Rick Byers’ reasoning
on blink-dev [1].

[1]https://groups.google.com/a/chromium.org/d/msg/blink-dev/sFOpNuQ91UU/3u1HxbnQCQAJ

Bug: 627682
Signed-off-by: DongJun Kim <djmix.kim@samsung.com>
Change-Id: I55afbc42c98ce105a7f94aa572ebb389115f619b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108240Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Frédéric Wang <fwang@igalia.com>
Cr-Commit-Position: refs/heads/master@{#754766}

third_party/blink/renderer/core/html/forms/color_input_type.cc

@@ -188,7 +188,7 @@ bool ColorInputType::TypeMismatchFor(const String& value) const {
 }
 
 void ColorInputType::WarnIfValueIsInvalid(const String& value) const {
-  if (!DeprecatedEqualIgnoringCase(value, GetElement().SanitizeValue(value)))
+  if (!EqualIgnoringASCIICase(value, GetElement().SanitizeValue(value)))
     AddWarningToConsole(
         "The specified value %s does not conform to the required format.  The "
         "format is \"#rrggbb\" where rr, gg, bb are two-digit hexadecimal "