Moves RenderProcessHostImpl::init_time() to RenderProcessHost to fix broken test.

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 fb1206e39c288cd11e295aa851cbe421fcdca95a..7b30a6f985e275be644f3dccc0f1f0d5961a89ad 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -223,6 +223,12 @@ ServiceRegistry* MockRenderProcessHost::GetServiceRegistry() {
   return NULL;
 }
 
+const base::TimeTicks& MockRenderProcessHost::GetInitTimeForNavigationMetrics()
+    const {
+  static base::TimeTicks dummy_time = base::TimeTicks::Now();
+  return dummy_time;
+}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }