Implement Harmony-style consistent button widths for Collected Cookies.

chrome/browser/ui/views/harmony/layout_delegate.h

Index: chrome/browser/ui/views/harmony/layout_delegate.h
diff --git a/chrome/browser/ui/views/harmony/layout_delegate.h b/chrome/browser/ui/views/harmony/layout_delegate.h
index 9841b67c9e3f24dfff94c554e74ac90936bda2eb..0147e7db16605e2ae9a9cb6aef893a2bd5c81859 100644
--- a/chrome/browser/ui/views/harmony/layout_delegate.h
+++ b/chrome/browser/ui/views/harmony/layout_delegate.h
@@ -48,6 +48,9 @@ class LayoutDelegate {
     UNRELATED_CONTROL_VERTICAL_SPACING,
     // Larger vertical spacing between unrelated controls.
     UNRELATED_CONTROL_VERTICAL_SPACING_LARGE,
+    // The maximum width, beyond which a button will not influence the widths of
+    // other buttons on a shared row.

[Peter Kasting, 2017/03/07 02:50:37]

Nit: Maybe "The maximum width a button can have and still influence the sizes of
other linked buttons.  This allows short buttons to have linked widths without
long buttons making things overly wide."

[tapted, 2017/03/07 12:06:41]

Done.

+    BUTTON_MAX_SHARED_WIDTH,

[Peter Kasting, 2017/03/07 02:50:37]

Nit: Alphabetize

I might call this BUTTON_MAX_LINKABLE_WIDTH?  (Really it should be MAXIMUM to be
parallel to MINIMUM above, but I'd rather fix that by changing those MINIMUMs to
MINs.)  I mostly am trying to avoid making it sound like this width is shared
among several buttons or something, and in GridLayout this is about "linking"
rather than "sharing" sizes.

[tapted, 2017/03/07 12:06:41]

Done.
sounds good :) Done.

   };
 
   enum class DialogWidth {