For some vector icons, get the size from the vector definition.

chrome/browser/ui/views/toolbar/wrench_toolbar_button.cc

Index: chrome/browser/ui/views/toolbar/wrench_toolbar_button.cc
diff --git a/chrome/browser/ui/views/toolbar/wrench_toolbar_button.cc b/chrome/browser/ui/views/toolbar/wrench_toolbar_button.cc
index ff2638fcb45b95756c876da8ef353c2e9bd7340c..b3394703b0ad2b82c0350c270805a4565616e2ba 100644
--- a/chrome/browser/ui/views/toolbar/wrench_toolbar_button.cc
+++ b/chrome/browser/ui/views/toolbar/wrench_toolbar_button.cc
@@ -139,11 +139,9 @@ void WrenchToolbarButton::UpdateIcon() {
       break;
   }
 
-  // TODO(estade): find a home for this constant.
-  const int kButtonSize = 16;
-  SetImage(views::Button::STATE_NORMAL,
-           gfx::CreateVectorIcon(gfx::VectorIconId::BROWSER_TOOLS, kButtonSize,
-                                 color));
+  SetImage(
+      views::Button::STATE_NORMAL,
+      gfx::CreatePrimaryVectorIcon(gfx::VectorIconId::BROWSER_TOOLS, color));
 }
 
 const char* WrenchToolbarButton::GetClassName() const {