Revert accidental dartium code push

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index fc9149bf071915b7f314c24c520c97c36bbc9cd1..e245a0efc9d452a83304dffceefda4b8fa56c67d 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -504,14 +504,7 @@ std::string ChromeContentClient::GetProduct() const {
 }
 
 std::string ChromeContentClient::GetUserAgent() const {
-  std::string product = GetProduct();
-  product += " (Dart)";
-#if defined(OS_ANDROID)
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kUseMobileUserAgent))
-    product += " Mobile";
-#endif
-  return webkit_glue::BuildUserAgentFromProduct(product);
+  return ::GetUserAgent();
 }
 
 base::string16 ChromeContentClient::GetLocalizedString(int message_id) const {