Revert of Add RGB565 Texture readback support in gl_helper

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index e6b867e22d676b0c094dd0036223a55faea62084..e06ed4faf2f51c4c2bcec7583c9547a0770c254f 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1057,8 +1057,7 @@
 void RenderWidgetHostViewAura::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
-    const base::Callback<void(bool, const SkBitmap&)>& callback,
-    bool readback_config_rgb565) {
+    const base::Callback<void(bool, const SkBitmap&)>& callback) {
   if (!CanCopyToBitmap()) {
     callback.Run(false, SkBitmap());
     return;
@@ -1069,7 +1068,6 @@
       cc::CopyOutputRequest::CreateRequest(base::Bind(
           &RenderWidgetHostViewAura::CopyFromCompositingSurfaceHasResult,
           dst_size_in_pixel,
-          readback_config_rgb565,
           callback));
   gfx::Rect src_subrect_in_pixel =
       ConvertRectToPixel(current_device_scale_factor_, src_subrect);
@@ -1802,7 +1800,6 @@
 // static
 void RenderWidgetHostViewAura::CopyFromCompositingSurfaceHasResult(
     const gfx::Size& dst_size_in_pixel,
-    bool readback_config_rgb565,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     scoped_ptr<cc::CopyOutputResult> result) {
   if (result->IsEmpty() || result->size().IsEmpty()) {
@@ -1811,9 +1808,7 @@
   }
 
   if (result->HasTexture()) {
-    PrepareTextureCopyOutputResult(dst_size_in_pixel, readback_config_rgb565,
-                                   callback,
-                                   result.Pass());
+    PrepareTextureCopyOutputResult(dst_size_in_pixel, callback, result.Pass());
     return;
   }
 
@@ -1835,7 +1830,6 @@
 // static
 void RenderWidgetHostViewAura::PrepareTextureCopyOutputResult(
     const gfx::Size& dst_size_in_pixel,
-    bool readback_config_rgb565,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     scoped_ptr<cc::CopyOutputResult> result) {
   base::ScopedClosureRunner scoped_callback_runner(
@@ -1877,7 +1871,6 @@
       gfx::Rect(result->size()),
       dst_size_in_pixel,
       pixels,
-      readback_config_rgb565,
       base::Bind(&CopyFromCompositingSurfaceFinished,
                  callback,
                  base::Passed(&release_callback),