[ios] Improve toolbar in tab_grid

ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm

Index: ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm
diff --git a/ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm
index 3810646144ee3e1047b5ba7e3299c2f504c9f1f8..6c2907213a4e9299fcb24465eb5b0d169c8c6ea6 100644
--- a/ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm
+++ b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm
@@ -12,7 +12,6 @@ namespace {
 const CGFloat kMinTabWidth = 200.0f;
 const CGFloat kMaxTabWidth = 250.0f;
 const CGFloat kInterTabSpacing = 20.0f;
-const UIEdgeInsets kSectionInset = {20.0f, 20.0f, 20.0f, 20.0f};
 }
 
 @implementation TabGridCollectionViewLayout
@@ -38,7 +37,7 @@ const UIEdgeInsets kSectionInset = {20.0f, 20.0f, 20.0f, 20.0f};
     tabWidth = (boundsSize.width - kInterTabSpacing * (columns + 1)) / columns;
   }
   self.itemSize = CGSizeMake(tabWidth, tabWidth);
-  self.sectionInset = kSectionInset;
+  self.sectionInset = UIEdgeInsetsMake(10.0f, 20.0f, 20.0f, 20.0f);
   self.minimumLineSpacing = kInterTabSpacing;
   self.minimumInteritemSpacing = kInterTabSpacing;
 }