[Mac] Turn on Auto Layout for browser windows.

chrome/browser/ui/cocoa/full_size_content_window.mm

 // Copyright 2014 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/full_size_content_window.h"
 
 #include <crt_externs.h>
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 14 matching lines @@
   BOOL forceFrameFlag_;
 }
 
 // This method allows us to set the content view size since setFrameSize is
 // overridden to prevent the view from shrinking.
 - (void)forceFrame:(NSRect)frame;
 
 @end
 
 @implementation FullSizeContentView
 

[tapted, 2017/03/21 02:16:51]

nit: Maybe we want

#pragma mark - NSView Overrides

and 

#pragma mark - Private Methods

before forceFrame


So that it's clear where the methods are declared .(#pragma is consistent with
the rest of the file, but a comment works too and is probably how we'd do it in
a new file)

[Sidney San Martín, 2017/03/22 21:40:22]

Done.

+// Since Auto Layout and frame-based layout behave differently in small but
+// important ways (e.g. Auto Layout can restrict window resizing, frame-based
+// layout doesn't log a warning when a view's autoresizing mask can't be
+// maintained), ensure that it's on instead of letting it depend on content.
++ (BOOL)requiresConstraintBasedLayout {
+  return YES;
+}
+
 // This method is directly called by AppKit during a live window resize.
 // Override it to prevent the content view from shrinking.
 - (void)setFrameSize:(NSSize)size {
   if ([self superview] && !forceFrameFlag_)
     size = [[self superview] bounds].size;
   [super setFrameSize:size];
 }
 
 - (void)forceFrame:(NSRect)frame {
   forceFrameFlag_ = YES;
@@ skipping 154 matching lines @@
   return [super contentRectForFrameRect:fRect styleMask:aStyle];
 }
 
 - (NSRect)contentRectForFrameRect:(NSRect)frameRect {
   if (chromeWindowView_)
     return frameRect;
   return [super contentRectForFrameRect:frameRect];
 }
 
 @end