Revert of [Mac][Material Design] Bring Omnibox stroke and MD colors up to spec.

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

Index: chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
index 7f55655c7d55c9e39e201374d6d4de30ca3f50b7..9783982c981bc6c1ea248ec0a057f2a0c7473af6 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
@@ -98,22 +98,19 @@
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return ColorWithRGBBytes(0x07, 0x95, 0x00);
   }
-  return in_dark_mode
-      ? skia::SkColorToSRGBNSColor(SkColorSetA(SK_ColorWHITE, 0x7F))
-      : skia::SkColorToSRGBNSColor(gfx::kGoogleGreen700);
+  return in_dark_mode ? [NSColor colorWithCalibratedWhite:1 alpha:0.5]
+                      : skia::SkColorToCalibratedNSColor(gfx::kGoogleGreen700);
 }
 NSColor* SecurityWarningSchemeColor(bool in_dark_mode) {
-  return in_dark_mode
-      ? skia::SkColorToSRGBNSColor(SkColorSetA(SK_ColorWHITE, 0x7F))
-      : skia::SkColorToSRGBNSColor(gfx::kGoogleYellow700);
+  return in_dark_mode ? [NSColor colorWithCalibratedWhite:1 alpha:0.5]
+                      : skia::SkColorToCalibratedNSColor(gfx::kGoogleYellow700);
 }
 NSColor* SecurityErrorSchemeColor(bool in_dark_mode) {
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return ColorWithRGBBytes(0xa2, 0x00, 0x00);
   }
-  return in_dark_mode
-      ? skia::SkColorToSRGBNSColor(SkColorSetA(SK_ColorWHITE, 0x7F))
-      : skia::SkColorToSRGBNSColor(gfx::kGoogleRed700);
+  return in_dark_mode ? [NSColor colorWithCalibratedWhite:1 alpha:0.5]
+                      : skia::SkColorToCalibratedNSColor(gfx::kGoogleRed700);
 }
 
 const char kOmniboxViewMacStateKey[] = "OmniboxViewMacState";
@@ -175,7 +172,7 @@
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return [NSColor darkGrayColor];
   }
-  return skia::SkColorToSRGBNSColor(BaseTextColorSkia(in_dark_mode));
+  return skia::SkColorToCalibratedNSColor(BaseTextColorSkia(in_dark_mode));
 }
 
 OmniboxViewMac::OmniboxViewMac(OmniboxEditController* controller,