Fix process reuse for dedicated processes when over process limit.

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index 4289b05671ede98f07237d5c59ff4e00041c5524..efabfce444a60371907bca9a41666f0b3fdac22d 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -46,6 +46,7 @@ MockRenderProcessHost::MockRenderProcessHost(BrowserContext* browser_context)
       deletion_callback_called_(false),
       is_for_guests_only_(false),
       is_process_backgrounded_(false),
+      is_unused_(true),
       worker_ref_count_(0),
       weak_ptr_factory_(this) {
   // Child process security operations can't be unit tested unless we add
@@ -358,6 +359,14 @@ bool MockRenderProcessHost::MayReuseHost() {
   return true;
 }
 
+bool MockRenderProcessHost::IsUnused() {
+  return is_unused_;
+}
+
+void MockRenderProcessHost::SetIsUsed() {
+  is_unused_ = false;
+}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }