Revert of Mojo multiple command buffer support and sample

Revert of Mojo multiple command buffer support and sample (patchset #6 of https://codereview.chromium.org/451753003/)

Reason for revert:
Reverting because this closed the tree due to a failed compile step on Linux Builder (dbg)(32). See http://build.chromium.org/p/chromium.linux/builders/Linux%20Builder%20%28dbg%29%2832%29/builds/27701

Original issue's description:
> Mojo multiple command buffer support and sample
> 
> TBR=danakj@chromium.org for DEPS file shuffle that moves a "+ui/gfx"
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290157

TBR=darin@chromium.org,piman@chromium.org,jamesr@chromium.org
NOTREECHECKS=true
NOTRY=true

[tdanderson, 2014-08-16 22:24:53]

Created Revert of Mojo multiple command buffer support and sample

[commit-bot: I haz the power, 2014-08-16 22:25:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tdanderson@chromium.org/480723002/1

[commit-bot: I haz the power, 2014-08-16 22:27:13]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-16 22:27:13]

Failed to apply patch for mojo/examples/compositor_app/compositor_app.cc:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file mojo/examples/compositor_app/compositor_app.cc
  Hunk #1 FAILED at 11.
  Hunk #2 FAILED at 29.
  Hunk #3 FAILED at 54.
  3 out of 3 hunks FAILED -- saving rejects to file
mojo/examples/compositor_app/compositor_app.cc.rej

Patch:       mojo/examples/compositor_app/compositor_app.cc
Index: mojo/examples/compositor_app/compositor_app.cc
diff --git a/mojo/examples/compositor_app/compositor_app.cc
b/mojo/examples/compositor_app/compositor_app.cc
index
c169d14c1258c66549edb2fcf70ca63bef24c2f2..513379e6d0fcaf0e7d03291c9b9b0302f19b29d2
100644
--- a/mojo/examples/compositor_app/compositor_app.cc
+++ b/mojo/examples/compositor_app/compositor_app.cc
@@ -11,7 +11,6 @@
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
-#include "mojo/services/public/interfaces/gpu/gpu.mojom.h"
 #include
"mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 #include "ui/gfx/rect.h"
 
@@ -29,22 +28,22 @@
     viewport_->Create(Rect::From(gfx::Rect(10, 10, 800, 600)));
     viewport_->Show();
 
-    // TODO(jamesr): Should be mojo:mojo_gpu_service
-    app->ConnectToService("mojo:mojo_native_viewport_service", &gpu_service_);
+    MessagePipe pipe;
+    viewport_->CreateGLES2Context(
+        MakeRequest<CommandBuffer>(pipe.handle0.Pass()));
+    host_.reset(new CompositorHost(pipe.handle1.Pass()));
   }
 
-  virtual void OnCreated(uint64_t native_viewport_id) OVERRIDE {
-    CommandBufferPtr cb;
-    gpu_service_->CreateOnscreenGLES2Context(
-        native_viewport_id, Size::From(gfx::Size(800, 600)), Get(&cb));
-    host_.reset(new CompositorHost(cb.PassMessagePipe()));
+  virtual void OnCreated() OVERRIDE {
   }
 
-  virtual void OnDestroyed() OVERRIDE { base::MessageLoop::current()->Quit(); }
+  virtual void OnDestroyed(const mojo::Callback<void()>& callback) OVERRIDE {
+    base::MessageLoop::current()->Quit();
+    callback.Run();
+  }
 
   virtual void OnBoundsChanged(RectPtr bounds) OVERRIDE {
-    if (host_)
-      host_->SetSize(gfx::Size(bounds->width, bounds->height));
+    host_->SetSize(gfx::Size(bounds->width, bounds->height));
   }
 
   virtual void OnEvent(EventPtr event,
@@ -54,7 +53,6 @@
 
  private:
   NativeViewportPtr viewport_;
-  GpuPtr gpu_service_;
   scoped_ptr<CompositorHost> host_;
   DISALLOW_COPY_AND_ASSIGN(SampleApp);
 };