Remove placeholder cases for incognito results table colors.

ui/native_theme/native_theme_dark_aura.cc

 // Copyright 2015 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/native_theme/native_theme_dark_aura.h"
 
 #include "ui/base/resource/material_design/material_design_controller.h"
 #include "ui/gfx/color_palette.h"
 
 namespace ui {
@@ skipping 56 matching lines @@
       return kResultsTableDimmedText;
 
     // Intentional pass-throughs to NativeThemeAura.
     case kColorId_ResultsTableHoveredBackground:
     case kColorId_ResultsTableSelectedBackground:
     case kColorId_ResultsTableNormalUrl:
     case kColorId_ResultsTableHoveredUrl:
     case kColorId_ResultsTableSelectedUrl:
       return NativeThemeAura::GetSystemColor(color_id);
 
-    // Temporary pass-throughs to NativeThemeAura, for colors not yet defined
-    // for dark themes. TODO(estade): define colors for these and remove this
-    // block.
-    case kColorId_ResultsTablePositiveText:
-    case kColorId_ResultsTablePositiveHoveredText:
-    case kColorId_ResultsTablePositiveSelectedText:
-    case kColorId_ResultsTableNegativeText:
-    case kColorId_ResultsTableNegativeHoveredText:
-    case kColorId_ResultsTableNegativeSelectedText:
-      return NativeThemeAura::GetSystemColor(color_id);
-
     // Any other color is not defined and shouldn't be used in a dark theme.
     default:
       return gfx::kPlaceholderColor;
   }
 }
 
 NativeThemeDarkAura::NativeThemeDarkAura() {}
 
 NativeThemeDarkAura::~NativeThemeDarkAura() {}
 
 }  // namespace ui