ipc: Move AttachmentBrokerPrivileged singleton logic into ipc/.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 9180fdb96308535a63953ba4822c2453529809f6..8de17e409548e7e74950ca875119f4fe51a39895 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -153,6 +153,8 @@
 #include "gpu/command_buffer/client/gpu_switches.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
+#include "ipc/attachment_broker.h"
+#include "ipc/attachment_broker_privileged.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_logging.h"
 #include "ipc/ipc_switches.h"
@@ -549,6 +551,14 @@ RenderProcessHostImpl::RenderProcessHostImpl(
   if (BootstrapSandboxManager::ShouldEnable())
     AddObserver(BootstrapSandboxManager::GetInstance());
 #endif
+
+#if USE_ATTACHMENT_BROKER
+  // Construct the privileged attachment broker early in the life cycle of a
+  // child process. This ensures that when a test is being run in one of the
+  // single process modes, the global attachment broker is the privileged
+  // attachment broker, rather than an unprivileged attachment broker.
+  IPC::AttachmentBrokerPrivileged::CreateBrokerIfNeeded();
+#endif
 }
 
 // static
@@ -651,6 +661,9 @@ bool RenderProcessHostImpl::Init() {
   const std::string channel_id =
       IPC::Channel::GenerateVerifiedChannelID(std::string());
   channel_ = CreateChannelProxy(channel_id);
+#if USE_ATTACHMENT_BROKER
+  GetAttachmentBroker()->RegisterCommunicationChannel(channel_.get());
+#endif
 
   // Setup the Mojo channel.
   mojo_application_host_->Init();
@@ -1731,6 +1744,11 @@ void RenderProcessHostImpl::Cleanup() {
 #endif
     base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
     deleting_soon_ = true;
+
+#if USE_ATTACHMENT_BROKER
+  GetAttachmentBroker()->DeregisterCommunicationChannel(channel_.get());
+#endif
+
     // It's important not to wait for the DeleteTask to delete the channel
     // proxy. Kill it off now. That way, in case the profile is going away, the
     // rest of the objects attached to this RenderProcessHost start going