Remove explicit keyword from multi-argument constructors

chrome/browser/chromeos/login/rounded_rect_painter.cc

Index: chrome/browser/chromeos/login/rounded_rect_painter.cc
diff --git a/chrome/browser/chromeos/login/rounded_rect_painter.cc b/chrome/browser/chromeos/login/rounded_rect_painter.cc
index a5532c882d33496102f4b3af5cf9edeb8f53a322..883f1a757662ddba3f18b071a0cc9720abf0c16b 100644
--- a/chrome/browser/chromeos/login/rounded_rect_painter.cc
+++ b/chrome/browser/chromeos/login/rounded_rect_painter.cc
@@ -185,10 +185,10 @@ void RoundedRectBorder::GetInsets(gfx::Insets* insets) const {
 // Simple solid round background.
 class RoundedBackground : public views::Background {
  public:
-  explicit RoundedBackground(int corner_radius,
-                             int stroke_width,
-                             const SkColor& background_color,
-                             const SkColor& stroke_color)
+  RoundedBackground(int corner_radius,
+                    int stroke_width,
+                    const SkColor& background_color,
+                    const SkColor& stroke_color)
       : corner_radius_(corner_radius),
         stroke_width_(stroke_width),
         stroke_color_(stroke_color) {