Move some class-scope constants to file-scope in the lone subclass using them.

ui/views/layout/layout_constants.h

Index: ui/views/layout/layout_constants.h
diff --git a/ui/views/layout/layout_constants.h b/ui/views/layout/layout_constants.h
index 41060ef721ad8880f0405490a5f87b5f493e8421..798a4401cbcb8cb825a5253737c29acfab57693a 100644
--- a/ui/views/layout/layout_constants.h
+++ b/ui/views/layout/layout_constants.h
@@ -15,70 +15,70 @@
 namespace views {
 
 // Left or right margin.
-const int kPanelHorizMargin = 13;
+constexpr int kPanelHorizMargin = 13;
 
 // Top or bottom margin.
-const int kPanelVertMargin = 13;
+constexpr int kPanelVertMargin = 13;
 
 // When several controls are aligned vertically, the baseline should be spaced
 // by the following number of pixels.
-const int kPanelVerticalSpacing = 32;
+constexpr int kPanelVerticalSpacing = 32;
 
 // Vertical spacing between sub UI.
-const int kPanelSubVerticalSpacing = 24;
+constexpr int kPanelSubVerticalSpacing = 24;
 
 // Vertical spacing between a label and some control.
-const int kLabelToControlVerticalSpacing = 8;
+constexpr int kLabelToControlVerticalSpacing = 8;
 
 // Small horizontal spacing between controls that are logically related.
-const int kRelatedControlSmallHorizontalSpacing = 8;
+constexpr int kRelatedControlSmallHorizontalSpacing = 8;
 
 // Horizontal spacing between controls that are logically related.
-const int kRelatedControlHorizontalSpacing = 8;
+constexpr int kRelatedControlHorizontalSpacing = 8;
 
 // Vertical spacing between controls that are logically related.
-const int kRelatedControlVerticalSpacing = 8;
+constexpr int kRelatedControlVerticalSpacing = 8;
 
 // Small vertical spacing between controls that are logically related.
-const int kRelatedControlSmallVerticalSpacing = 4;
+constexpr int kRelatedControlSmallVerticalSpacing = 4;
 
 // Horizontal spacing between controls that are logically unrelated.
-const int kUnrelatedControlHorizontalSpacing = 12;
+constexpr int kUnrelatedControlHorizontalSpacing = 12;
 
 // Larger horizontal spacing between unrelated controls.
-const int kUnrelatedControlLargeHorizontalSpacing = 20;
+constexpr int kUnrelatedControlLargeHorizontalSpacing = 20;
 
 // Vertical spacing between controls that are logically unrelated.
-const int kUnrelatedControlVerticalSpacing = 20;
+constexpr int kUnrelatedControlVerticalSpacing = 20;
 
 // Larger vertical spacing between unrelated controls.
-const int kUnrelatedControlLargeVerticalSpacing = 30;
+constexpr int kUnrelatedControlLargeVerticalSpacing = 30;
 
 // Vertical spacing between the edge of the window and the
 // top or bottom of a button.
-const int kButtonVEdgeMargin = 9;
+constexpr int kButtonVEdgeMargin = 9;
 
 // Horizontal spacing between the edge of the window and the
 // left or right of a button.
-const int kButtonHEdgeMargin = 13;
+constexpr int kButtonHEdgeMargin = 13;
 
 // Vertical spacing between the edge of the window and the
 // top or bottom of a button (when using new style dialogs).
-const int kButtonVEdgeMarginNew = 20;
+constexpr int kButtonVEdgeMarginNew = 20;
 
 // Horizontal spacing between the edge of the window and the
 // left or right of a button (when using new style dialogs).
-const int kButtonHEdgeMarginNew = 20;
+constexpr int kButtonHEdgeMarginNew = 20;
 
 // Horizontal spacing between buttons that are logically related.
-const int kRelatedButtonHSpacing = 6;
+constexpr int kRelatedButtonHSpacing = 6;
 
 // Indent of checkboxes relative to related text.
-const int kCheckboxIndent = 10;
+constexpr int kCheckboxIndent = 10;
 
 // Horizontal spacing between the end of an item (i.e. an icon or a checkbox)
 // and the start of its corresponding text.
-const int kItemLabelSpacing = 10;
+constexpr int kItemLabelSpacing = 10;
 
 }  // namespace views