Revert of Set the Ash browser frame color for MD WebUI (Settings) (patchset #3...

Revert of Set the Ash browser frame color for MD WebUI (Settings) (patchset #3 id:40001 of https://codereview.chromium.org/2676673003/ )

Reason for revert:
Broke this builder:
https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Builder%20%28dbg%29/builds/83127

Original issue's description:
> Set the Ash browser frame color for MD WebUI (Settings)
>
> Currently Settings is the only Web IU we show in a dedicated browser
> window on Ash (Chrome OS).
>
> BUG=684129
>
> Review-Url: https://codereview.chromium.org/2676673003
> Cr-Commit-Position: refs/heads/master@{#448024}
> Committed: https://chromium.googlesource.com/chromium/src/+/31dc779f1ecd8dabd26dfed11bef773c95ae5b47

TBR=sky@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=684129

Review-Url: https://codereview.chromium.org/2672083002
Cr-Commit-Position: refs/heads/master@{#448029}

chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc

@@ -15,7 +15,6 @@
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
-#include "base/feature_list.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/themes/theme_properties.h"
@@ -31,10 +30,8 @@
 #include "chrome/browser/ui/views/tabs/tab_strip.h"
 #include "chrome/browser/ui/views/toolbar/toolbar_view.h"
 #include "chrome/browser/web_applications/web_app.h"
-#include "chrome/common/chrome_features.h"
 #include "chrome/grit/theme_resources.h"
 #include "content/public/browser/web_contents.h"
-#include "third_party/skia/include/core/SkColor.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
@@ -57,13 +54,11 @@
 namespace {
 
 // Space between right edge of tabstrip and maximize button.
-constexpr int kTabstripRightSpacing = 10;
+const int kTabstripRightSpacing = 10;
 // Height of the shadow in the tab image, used to ensure clicks in the shadow
 // area still drag restored windows.  This keeps the clickable area large enough
 // to hit easily.
-constexpr int kTabShadowHeight = 4;
-
-constexpr SkColor kMdWebUIFrameColor = SkColorSetRGB(0x25, 0x4f, 0xae);
+const int kTabShadowHeight = 4;
 
 }  // namespace
 
@@ -105,11 +100,6 @@ void BrowserNonClientFrameViewAsh::Init() {
     header_painter->Init(frame(), this, caption_button_container_);
     if (window_icon_)
       header_painter->UpdateLeftHeaderView(window_icon_);
-    if (base::FeatureList::IsEnabled(features::kMaterialDesignSettings)) {
-      // For non app (i.e. WebUI) windows (e.g. Settings) use MD frame color.
-      if (!browser_view()->browser()->is_app())
-        header_painter->SetFrameColors(kMdWebUIFrameColor, kMdWebUIFrameColor);
-    }
   } else {
     BrowserHeaderPainterAsh* header_painter = new BrowserHeaderPainterAsh;
     header_painter_.reset(header_painter);