[Mac] Turn on Auto Layout for browser windows.

chrome/browser/ui/cocoa/full_size_content_window.mm

Index: chrome/browser/ui/cocoa/full_size_content_window.mm
diff --git a/chrome/browser/ui/cocoa/full_size_content_window.mm b/chrome/browser/ui/cocoa/full_size_content_window.mm
index 3b4c82b2e1e22f2dedc6816bb12a8f3748825098..481d09ebc58eaf781c62f7c94cf7515d768d24d9 100644
--- a/chrome/browser/ui/cocoa/full_size_content_window.mm
+++ b/chrome/browser/ui/cocoa/full_size_content_window.mm
@@ -33,6 +33,14 @@
 
 @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 {