[Mac][Material Design] Adjust Omnibox focus ring color for Incognito mode.

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ skipping 403 matching lines @@
       NSRect focusRingRect =
           NSInsetRect(frame, singlePixelLineWidth_, singlePixelLineWidth_);
       path = [NSBezierPath bezierPathWithRoundedRect:focusRingRect
                                              xRadius:kCornerRadius
                                              yRadius:kCornerRadius];
       [path setLineWidth:singlePixelLineWidth_ * 2.0];
     }
 
     CGFloat alphaComponent = 0.5 / singlePixelLineWidth_;
     if (isModeMaterial && inDarkMode) {
-      alphaComponent = 1;
+      // Special focus color for Material Incognito.
+      [[NSColor colorWithSRGBRed:123 / 255.
+                           green:170 / 255.
+                            blue:247 / 255.
+                           alpha:1] set];
+    } else {
+      [[[NSColor keyboardFocusIndicatorColor]
+          colorWithAlphaComponent:alphaComponent] set];
     }
-    [[[NSColor keyboardFocusIndicatorColor]
-        colorWithAlphaComponent:alphaComponent] set];
     [path stroke];
   }
 }
 
 - (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView*)controlView {
   std::vector<LocationBarDecoration*> decorations;
   std::vector<NSRect> decorationFrames;
   NSRect workingFrame;
 
   CalculatePositionsInFrame(cellFrame, leftDecorations_, rightDecorations_,
@@ skipping 336 matching lines @@
 
 - (void)handleFocusEvent:(NSEvent*)event
                   ofView:(AutocompleteTextField*)controlView {
   if ([controlView observer]) {
     const bool controlDown = ([event modifierFlags] & NSControlKeyMask) != 0;
     [controlView observer]->OnSetFocus(controlDown);
   }
 }
 
 @end