[cleanup] Remove LayoutThemeDefault::caret_blink_interval_.

Not sure what this one was doing.
There should be no behaviour change.

Change-Id: Id06d09013d54617e8928033c04e728cab9471a30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369494Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801157}

third_party/blink/renderer/core/layout/layout_theme_default.cc

@@ -45,15 +45,12 @@ static const float kDefaultCancelButtonSize = 9;
 static const float kMinCancelButtonSize = 5;
 static const float kMaxCancelButtonSize = 21;
 
-base::TimeDelta LayoutThemeDefault::caret_blink_interval_;
-
 Color LayoutThemeDefault::active_selection_background_color_ = 0xff1e90ff;
 Color LayoutThemeDefault::active_selection_foreground_color_ = Color::kBlack;
 Color LayoutThemeDefault::inactive_selection_background_color_ = 0xffc8c8c8;
 Color LayoutThemeDefault::inactive_selection_foreground_color_ = 0xff323232;
 
 LayoutThemeDefault::LayoutThemeDefault() : LayoutTheme(), painter_(*this) {
-  caret_blink_interval_ = LayoutTheme::CaretBlinkInterval();
 }
 
 LayoutThemeDefault::~LayoutThemeDefault() = default;

third_party/blink/renderer/core/layout/layout_theme_default.h

@@ -107,8 +107,6 @@ class CORE_EXPORT LayoutThemeDefault : public LayoutTheme {
 
   static const RGBA32 kDefaultTapHighlightColor = 0x2e000000;  // 18% black.
 
-  static base::TimeDelta caret_blink_interval_;
-
   static Color active_selection_background_color_;
   static Color active_selection_foreground_color_;
   static Color inactive_selection_background_color_;