Initialize FontConfigIPC when zygote is disabled so font fallback works.

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 5731df87c71d0f4de76657e505412749ca546a1b..f6c7c7153b2f5bd1d591347b16c76e02fe5ab2fd 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1697,6 +1697,13 @@ void RenderProcessHostImpl::AppendRendererCommandLine(
       GetContentClient()->browser()->GetApplicationLocale();
   command_line->AppendSwitchASCII(switches::kLang, locale);
 
+  // A non-empty RendererCmdPrefix implies that Zygote is disabled.
+  if (!base::CommandLine::ForCurrentProcess()
+           ->GetSwitchValueNative(switches::kRendererCmdPrefix)
+           .empty()) {
+    command_line->AppendSwitch(switches::kNoZygote);
+  }
+
   GetContentClient()->browser()->AppendExtraCommandLineSwitches(command_line,
                                                                 GetID());
 
@@ -1840,6 +1847,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kMSEVideoBufferSizeLimit,
     switches::kNoReferrers,
     switches::kNoSandbox,
+    switches::kNoZygote,
     switches::kOverridePluginPowerSaverForTesting,
     switches::kPassiveListenersDefault,
     switches::kPpapiInProcess,