Use capturing with XGetImage() only in screenshot_taker.

chrome/browser/ui/window_snapshot/window_snapshot_aura.cc

Index: chrome/browser/ui/window_snapshot/window_snapshot_aura.cc
diff --git a/chrome/browser/ui/window_snapshot/window_snapshot_aura.cc b/chrome/browser/ui/window_snapshot/window_snapshot_aura.cc
index bb1c59477488047758a7a16f3d1772b7584e39c9..29a7417f1ff501866bfb1b4475a7e08eeb02a6fa 100644
--- a/chrome/browser/ui/window_snapshot/window_snapshot_aura.cc
+++ b/chrome/browser/ui/window_snapshot/window_snapshot_aura.cc
@@ -6,7 +6,6 @@
 
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkBitmap.h"
-#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/dip_util.h"
@@ -19,14 +18,6 @@ namespace browser {
 bool GrabWindowSnapshot(gfx::NativeWindow window,
                         std::vector<unsigned char>* png_representation,
                         const gfx::Rect& snapshot_bounds) {
-#if defined(OS_LINUX)
-  // We use XGetImage() for Linux/ChromeOS for performance reasons.
-  // See crbug.com/122720
-  if (window->GetRootWindow()->GrabSnapshot(
-          snapshot_bounds, png_representation))
-    return true;
-#endif  // OS_LINUX
-
   ui::Compositor* compositor = window->layer()->GetCompositor();
 
   gfx::Rect read_pixels_bounds = snapshot_bounds;