memory-infra: Finish moving to Mojo (3nd attempt)

content/public/common/child_process_host.h

Index: content/public/common/child_process_host.h
diff --git a/content/public/common/child_process_host.h b/content/public/common/child_process_host.h
index 6a541cb1048a20e0611ecff1dada98a0d7b61b47..51e617f8e901715bf2709aeb954d70733ad5ebde 100644
--- a/content/public/common/child_process_host.h
+++ b/content/public/common/child_process_host.h
@@ -40,11 +40,6 @@ class CONTENT_EXPORT ChildProcessHost : public IPC::Sender {
   // any kind, including the values returned by RenderProcessHost::GetID().
   static int kInvalidUniqueID;
 
-  // This value is used as the tracing id of the browser process for identifying
-  // cross-process shared memory segments when tracing.
-  // Note: In single-process mode all the clients of tracing will use this id.
-  static uint64_t kBrowserTracingProcessId;
-
   // Used to create a child process host. The delegate must outlive this object.
   static ChildProcessHost* Create(ChildProcessHostDelegate* delegate);