Move --user-agent overriding logic from chrome into content.

content/shell/shell_main_delegate.cc

Index: content/shell/shell_main_delegate.cc
diff --git a/content/shell/shell_main_delegate.cc b/content/shell/shell_main_delegate.cc
index 01157ab51d39b3eb26789da6e1b550a1ea41cc8e..32439fefc9c5429e6fc68eea6b449fc0fa7a9a31 100644
--- a/content/shell/shell_main_delegate.cc
+++ b/content/shell/shell_main_delegate.cc
@@ -15,6 +15,7 @@
 #include "content/shell/shell_content_utility_client.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
+#include "webkit/glue/user_agent.h"
 
 #if defined(OS_MACOSX)
 #include "content/shell/paths_mac.h"
@@ -42,7 +43,13 @@ void ShellMainDelegate::PreSandboxStartup() {
   std::string process_type =
       command_line.GetSwitchValueASCII(switches::kProcessType);
 
-  content::SetContentClient(&content_client_);
+  // The "19" is so that sites that sniff for version think that this is
+  // something reasonably current; the "77.34.5" is a hint that this isn't a
+  // standard Chrome.
+  std::string user_agent =
+      webkit_glue::BuildUserAgentFromProduct("Chrome/19.77.34.5");
+
+  content::Initialize(&content_client_, user_agent);
   InitializeShellContentClient(process_type);
 
   InitializeResourceBundle();