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

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

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
index a8bb4629c524dc8ad0f9f5ab4ac2dae33165c493..ef0ddd32bb4a27bded9a8c6c2e74e7097deb1ec5 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
@@ -351,13 +351,56 @@
   // Draw the border.
   if (isModeMaterial) {
     if (!inDarkMode) {
-      const CGFloat kNormalStrokeGray = 168 / 255.;
-      [[NSColor colorWithCalibratedWhite:kNormalStrokeGray alpha:1] set];
+      [[NSColor colorWithCalibratedWhite:168 / 255. alpha:1] set];
+      [path stroke];
     } else {
-      const CGFloat k30PercentAlpha = 0.3;
-      [[NSColor colorWithCalibratedWhite:0 alpha:k30PercentAlpha] set];
+      // In dark mode the top, middle, and bottom portions of the stroke are
+      // drawn in different colors.
+      {
+        gfx::ScopedNSGraphicsContextSaveGState saveState;
+        [[NSColor colorWithCalibratedWhite:52 / 255. alpha:1] set];
+        [NSBezierPath clipRect:NSMakeRect(NSMinX(frame), NSMaxY(frame) - 2,
+                                          NSWidth(frame), 2)];
+        [path stroke];
+      }
+      {
+        gfx::ScopedNSGraphicsContextSaveGState saveState;
+        [[NSColor colorWithCalibratedWhite:61 / 255. alpha:1] set];
+        [NSBezierPath clipRect:NSMakeRect(NSMinX(frame), NSMinY(frame) + 3,
+                                          NSWidth(frame), NSHeight(frame) - 5)];
+        [path stroke];
+      }
+      {
+        gfx::ScopedNSGraphicsContextSaveGState saveState;
+        [[NSColor colorWithCalibratedWhite:71 / 255. alpha:1] set];
+        [NSBezierPath clipRect:NSMakeRect(NSMinX(frame), NSMinY(frame),
+                                          NSWidth(frame), 3)];
+        [path stroke];
+      }
+
+      // Draw a highlight beneath the top edge, and a shadow beneath the bottom
+      // edge when on a Retina screen.
+      {
+        gfx::ScopedNSGraphicsContextSaveGState saveState;
+        [NSBezierPath setDefaultLineWidth:singlePixelLineWidth_];
+
+        [[NSColor colorWithCalibratedWhite:120 / 255. alpha:1] set];
+        NSPoint origin = NSMakePoint(NSMinX(pathRect) + 3,
+                                     NSMinY(pathRect) + singlePixelLineWidth_);
+        NSPoint destination =
+            NSMakePoint(NSMaxX(pathRect) - 3,
+                        NSMinY(pathRect) + singlePixelLineWidth_);
+        [NSBezierPath strokeLineFromPoint:origin
+                                  toPoint:destination];
+
+        if (singlePixelLineWidth_ < 1) {
+          origin.y = destination.y = NSMaxY(pathRect) + singlePixelLineWidth_;
+          [[AutocompleteTextField shadowColor] set];
+          [NSBezierPath strokeLineFromPoint:origin
+                                    toPoint:destination];
+        }
+      }
     }
-    [path stroke];
   } else {
     ui::DrawNinePartImage(frame,
                           isPopupMode_ ? kPopupBorderImageIds