Add more files to content_unittests.

content/browser/mock_content_browser_client.cc

Index: content/browser/mock_content_browser_client.cc
diff --git a/content/browser/mock_content_browser_client.cc b/content/browser/mock_content_browser_client.cc
index c1115e1c6507201c6eb73239cce4cf8fad5cd3c4..cb230b5beb9e2c6bafd37021199a9054c91f26be 100644
--- a/content/browser/mock_content_browser_client.cc
+++ b/content/browser/mock_content_browser_client.cc
@@ -44,6 +44,11 @@ GURL MockContentBrowserClient::GetEffectiveURL(
   return GURL();
 }
 
+bool MockContentBrowserClient::ShouldUseProcessPerSite(
+    BrowserContext* browser_context, const GURL& effective_url) {
+  return false;
+}
+
 bool MockContentBrowserClient::IsURLSameAsAnySiteInstance(const GURL& url) {
   return false;
 }