Use gpu::Mailbox instead of std:string in IPCs

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

Index: content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
index 6911f280af418e8603273583f65ce2c0d6ef1fa7..cd5cb3fb28fc799a1c192d591b066ec1d14e9337 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
@@ -949,7 +949,7 @@ TEST_F(RenderWidgetHostViewAuraTest, SwapNotifiesWindow) {
   GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params params;
   params.surface_id = widget_host_->surface_id();
   params.route_id = widget_host_->GetRoutingID();
-  params.mailbox_name = std::string(64, '1');
+  memset(params.mailbox.name, '1', sizeof(params.mailbox.name));
   params.size = view_size;
   params.scale_factor = 1.f;
 
@@ -968,7 +968,7 @@ TEST_F(RenderWidgetHostViewAuraTest, SwapNotifiesWindow) {
   GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params post_params;
   post_params.surface_id = widget_host_->surface_id();
   post_params.route_id = widget_host_->GetRoutingID();
-  post_params.mailbox_name = std::string(64, '1');
+  memset(post_params.mailbox.name, '1', sizeof(post_params.mailbox.name));
   post_params.surface_size = gfx::Size(200, 200);
   post_params.surface_scale_factor = 2.f;
   post_params.x = 40;