chore: remove mips64el patches as they've largely been upstreamed (#18628)

patches/chromium/browser_compositor_mac.patch

@@ -0,0 +1,44 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Cheng Zhao <zcbenz@gmail.com>
+Date: Thu, 20 Sep 2018 17:45:14 -0700
+Subject: browser_compositor_mac.patch
+
+
+diff --git a/content/browser/renderer_host/browser_compositor_view_mac.h b/content/browser/renderer_host/browser_compositor_view_mac.h
+index de89d291e5cbc0981cf06170ed35502a1239136d..656f6c38d55d9f9af569bc772254ca13c279eeab 100644
+--- a/content/browser/renderer_host/browser_compositor_view_mac.h
++++ b/content/browser/renderer_host/browser_compositor_view_mac.h
+@@ -60,6 +60,8 @@ class CONTENT_EXPORT BrowserCompositorMac : public DelegatedFrameHostClient,
+   // These will not return nullptr until Destroy is called.
+   DelegatedFrameHost* GetDelegatedFrameHost();
+ 
++  ui::Layer* GetRootLayer() { return root_layer_.get(); }
++
+   // Force a new surface id to be allocated. Returns true if the
+   // RenderWidgetHostImpl sent the resulting surface id to the renderer.
+   bool ForceNewSurfaceId();
+@@ -68,6 +70,7 @@ class CONTENT_EXPORT BrowserCompositorMac : public DelegatedFrameHostClient,
+   // no valid frame is available.
+   const gfx::CALayerParams* GetLastCALayerParams() const;
+ 
++  ui::Compositor* GetCompositor();
+   void DidCreateNewRendererCompositorFrameSink(
+       viz::mojom::CompositorFrameSinkClient* renderer_compositor_frame_sink);
+   void OnDidNotProduceFrame(const viz::BeginFrameAck& ack);
+diff --git a/content/browser/renderer_host/browser_compositor_view_mac.mm b/content/browser/renderer_host/browser_compositor_view_mac.mm
+index 4b3f3c7e97e73ad6d0166ad114f4168d9ed00e11..59e58d693c971742951434f6582140d9179235f2 100644
+--- a/content/browser/renderer_host/browser_compositor_view_mac.mm
++++ b/content/browser/renderer_host/browser_compositor_view_mac.mm
+@@ -80,6 +80,12 @@
+   DCHECK_EQ(1u, num_erased);
+ }
+ 
++ui::Compositor* BrowserCompositorMac::GetCompositor() {
++  if (recyclable_compositor_)
++    return recyclable_compositor_->compositor();
++  return nullptr;
++}
++
+ DelegatedFrameHost* BrowserCompositorMac::GetDelegatedFrameHost() {
+   DCHECK(delegated_frame_host_);
+   return delegated_frame_host_.get();