[Picture in Picture] Adjust size of close button.

This change makes the button a little smaller with less buffer white
space around it.

Bug: None
Change-Id: I6bb7bb6e2ee6f773c7c85019055abbc694a5d312
Reviewed-on: https://chromium-review.googlesource.com/1075852Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562577}

chrome/browser/ui/views/overlay/overlay_window_views.cc

@@ -35,7 +35,7 @@ constexpr gfx::Size kMinWindowSize = gfx::Size(144, 100);
 const int kBorderThickness = 5;
 const int kResizeAreaCornerSize = 16;
 
-constexpr gfx::Size kCloseButtonSize = gfx::Size(42, 42);
+constexpr gfx::Size kCloseButtonSize = gfx::Size(36, 36);
 constexpr gfx::Size kPlayPauseButtonSize = gfx::Size(90, 90);
 
 const int kCloseButtonMargin = 8;
@@ -216,7 +216,8 @@ void OverlayWindowViews::SetUpViews() {
                                           views::ImageButton::ALIGN_MIDDLE);
   close_controls_view_->SetImage(
       views::Button::STATE_NORMAL,
-      gfx::CreateVectorIcon(views::kIcCloseIcon, kCloseButtonSize.width() / 2,
+      gfx::CreateVectorIcon(views::kIcCloseIcon,
+                            kCloseButtonSize.width() * 2 / 3,
                             kControlIconColor));
   close_controls_view_->SetBackgroundImageAlignment(
       views::ImageButton::ALIGN_LEFT, views::ImageButton::ALIGN_TOP);