Fix Clipboard::ReadImage

ui/base/clipboard/clipboard_linux.cc

Index: ui/base/clipboard/clipboard_linux.cc
diff --git a/ui/base/clipboard/clipboard_linux.cc b/ui/base/clipboard/clipboard_linux.cc
index 718fed5b4c73321147490273f3bf38bb08ef5337..ad089ad7eed5aad322b881e499546062c38a36c8 100644
--- a/ui/base/clipboard/clipboard_linux.cc
+++ b/ui/base/clipboard/clipboard_linux.cc
@@ -388,10 +388,12 @@ SkBitmap Clipboard::ReadImage(Buffer buffer) const {
   gfx::CanvasSkia canvas(gdk_pixbuf_get_width(pixbuf.get()),
                          gdk_pixbuf_get_height(pixbuf.get()),
                          false);
-  skia::ScopedPlatformPaint scoped_platform_paint(&canvas);
-  cairo_t* context = scoped_platform_paint.GetPlatformSurface();
-  gdk_cairo_set_source_pixbuf(context, pixbuf.get(), 0.0, 0.0);
-  cairo_paint(context);
+  {
+    skia::ScopedPlatformPaint scoped_platform_paint(&canvas);
+    cairo_t* context = scoped_platform_paint.GetPlatformSurface();
+    gdk_cairo_set_source_pixbuf(context, pixbuf.get(), 0.0, 0.0);
+    cairo_paint(context);
+  }
   return canvas.ExtractBitmap();
 }