Mac Task Manager: Fix colors for selected rows.

"alternateSelectedControlTextColor" is a name with non-obvious
meaning, but it is (as per Apple header):

> Foreground color inside emphasized and selected content:
> table views rows, collection views, etc.

Tested by checking non-selected and selected rows from 10.10
through 10.15 in both light and dark mode.

Bug: 1018333
Change-Id: I38881d0e625ecce761f7e079d1346e5225bcc32a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890475
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710941}

chrome/browser/ui/cocoa/task_manager_mac.mm

@@ -553,12 +553,20 @@ bool ShouldUseViewsTaskManager() {
   if ([[tableColumn identifier] intValue] == IDS_TASK_MANAGER_TASK_COLUMN) {
     DCHECK([cell isKindOfClass:[NSButtonCell class]]);
     NSButtonCell* buttonCell = static_cast<NSButtonCell*>(cell);
+
     NSString* title = [self modelTextForRow:rowIndex
                                     column:[[tableColumn identifier] intValue]];
-    buttonCell.attributedTitle = [[[NSAttributedString alloc]
+    NSColor* textColor = [tableView isRowSelected:rowIndex]
+                             ? [NSColor alternateSelectedControlTextColor]
+                             : [NSColor labelColor];
+    NSAttributedString* attributedTitle = [[[NSAttributedString alloc]
         initWithString:title
-            attributes:@{NSForegroundColorAttributeName : [NSColor labelColor]}]
-        autorelease];
+            attributes:@{
+              NSForegroundColorAttributeName : textColor,
+              NSFontAttributeName : cell.font
+            }] autorelease];
+    buttonCell.attributedTitle = attributedTitle;
+
     buttonCell.image =
         taskManagerMac_->GetImageForRow(viewToModelMap_[rowIndex]);
     buttonCell.refusesFirstResponder = YES;  // Don't push in like a button.