Turn off the auto color readability of LabelButton in non-high contrast mode

ui/views/controls/button/label_button.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/button/label_button.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 478 matching lines @@
   };
 
   // Use hardcoded colors for inverted color scheme support and STYLE_BUTTON.
   if (color_utils::IsInvertedColorScheme()) {
     colors[STATE_NORMAL] = colors[STATE_HOVERED] = colors[STATE_PRESSED] =
         SK_ColorWHITE;
     label_->SetBackgroundColor(SK_ColorBLACK);
     label_->set_background(Background::CreateSolidBackground(SK_ColorBLACK));
     label_->SetAutoColorReadabilityEnabled(true);
     label_->SetShadows(gfx::ShadowValues());
-  } else if (style() == STYLE_BUTTON) {
-    PlatformStyle::ApplyLabelButtonTextStyle(label_, &colors);
+  } else {
+    if (style() == STYLE_BUTTON)
+      PlatformStyle::ApplyLabelButtonTextStyle(label_, &colors);
     label_->set_background(nullptr);
-  } else {
-    label_->set_background(nullptr);
+    label_->SetAutoColorReadabilityEnabled(false);
   }
 
   for (size_t state = STATE_NORMAL; state < STATE_COUNT; ++state) {
     if (!explicitly_set_colors_[state]) {
       SetTextColor(static_cast<ButtonState>(state), colors[state]);
       explicitly_set_colors_[state] = false;
     }
   }
 }
 
@@ skipping 74 matching lines @@
 void LabelButton::ResetLabelEnabledColor() {
   const SkColor color =
       explicitly_set_colors_[state()]
           ? button_state_colors_[state()]
           : PlatformStyle::TextColorForButton(button_state_colors_, *this);
   if (state() != STATE_DISABLED && label_->enabled_color() != color)
     label_->SetEnabledColor(color);
 }
 
 }  // namespace views