Resolves layering violation in SynchronousCompositorHost creation

content/browser/android/synchronous_compositor_host.cc

Index: content/browser/android/synchronous_compositor_host.cc
diff --git a/content/browser/android/synchronous_compositor_host.cc b/content/browser/android/synchronous_compositor_host.cc
index c0d33fbc765cfa4305ed9054b46c57b0c434746b..4f2e1f07ecc53d4566156df09d699699a7f08a02 100644
--- a/content/browser/android/synchronous_compositor_host.cc
+++ b/content/browser/android/synchronous_compositor_host.cc
@@ -13,7 +13,6 @@
 #include "base/trace_event/trace_event_argument.h"
 #include "content/browser/android/synchronous_compositor_browser_filter.h"
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
-#include "content/browser/web_contents/web_contents_android.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/android/sync_compositor_messages.h"
 #include "content/common/android/sync_compositor_statics.h"
@@ -32,41 +31,23 @@
 namespace content {
 
 // static
-void SynchronousCompositor::SetClientForWebContents(
-    WebContents* contents,
-    SynchronousCompositorClient* client) {
-  DCHECK(contents);
-  DCHECK(client);
-  WebContentsAndroid* web_contents_android =
-      static_cast<WebContentsImpl*>(contents)->GetWebContentsAndroid();
-  DCHECK(!web_contents_android->synchronous_compositor_client());
-  web_contents_android->set_synchronous_compositor_client(client);
-}
-
-// static
 std::unique_ptr<SynchronousCompositorHost> SynchronousCompositorHost::Create(
-    RenderWidgetHostViewAndroid* rwhva,
-    WebContents* web_contents) {
-  DCHECK(web_contents);
-  WebContentsAndroid* web_contents_android =
-      static_cast<WebContentsImpl*>(web_contents)->GetWebContentsAndroid();
-  if (!web_contents_android->synchronous_compositor_client())
+    RenderWidgetHostViewAndroid* rwhva) {
+  if (!rwhva->synchronous_compositor_client())
     return nullptr;  // Not using sync compositing.
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   bool use_in_proc_software_draw =
       command_line->HasSwitch(switches::kSingleProcess);
   return base::WrapUnique(new SynchronousCompositorHost(
-      rwhva, web_contents_android->synchronous_compositor_client(),
-      use_in_proc_software_draw));
+      rwhva, use_in_proc_software_draw));
 }
 
 SynchronousCompositorHost::SynchronousCompositorHost(
     RenderWidgetHostViewAndroid* rwhva,
-    SynchronousCompositorClient* client,
     bool use_in_proc_software_draw)
     : rwhva_(rwhva),
-      client_(client),
+      client_(rwhva->synchronous_compositor_client()),
       ui_task_runner_(BrowserThread::GetTaskRunnerForThread(BrowserThread::UI)),
       process_id_(rwhva_->GetRenderWidgetHost()->GetProcess()->GetID()),
       routing_id_(rwhva_->GetRenderWidgetHost()->GetRoutingID()),