Fix a regression where extension APIs would sometimes not be available on the

content/browser/renderer_host/browser_render_process_host.cc

Index: content/browser/renderer_host/browser_render_process_host.cc
diff --git a/content/browser/renderer_host/browser_render_process_host.cc b/content/browser/renderer_host/browser_render_process_host.cc
index a5318723c8634578fc69a4822280e82567ba3d2e..48c66bd41edb52d5a344146f4a4bb4b27c619923 100644
--- a/content/browser/renderer_host/browser_render_process_host.cc
+++ b/content/browser/renderer_host/browser_render_process_host.cc
@@ -244,6 +244,11 @@ BrowserRenderProcessHost::~BrowserRenderProcessHost() {
   ClearTransportDIBCache();
 }
 
+void BrowserRenderProcessHost::PrepareForReuse() {
+  // Reset is_initialized_ so we start queuing up messages passed to Send.
+  is_initialized_ = false;
+}
+
 bool BrowserRenderProcessHost::Init(bool is_accessibility_enabled) {
   // calling Init() more than once does nothing, this makes it more convenient
   // for the view host which may not be sure in some cases