Simplify the user agent code some more since after r255534 it's not affected by the site's URL.

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
===================================================================
--- chrome/common/chrome_content_client.cc	(revision 255867)
+++ chrome/common/chrome_content_client.cc	(working copy)
@@ -417,8 +417,27 @@
 #endif  // FLAPPER_AVAILABLE
 }
 
+std::string GetProduct() {
+  chrome::VersionInfo version_info;
+  return version_info.is_valid() ?
+      version_info.ProductNameAndVersionForUserAgent() : std::string();
+}
+
 }  // namespace
 
+std::string GetUserAgent() {
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kUserAgent))
+    return command_line->GetSwitchValueASCII(switches::kUserAgent);
+
+  std::string product = GetProduct();
+#if defined(OS_ANDROID)
+  if (command_line->HasSwitch(switches::kUseMobileUserAgent))
+    product += " Mobile";
+#endif
+  return webkit_glue::BuildUserAgentFromProduct(product);
+}
+
 void ChromeContentClient::SetActiveURL(const GURL& url) {
   base::debug::SetCrashKeyValue(crash_keys::kActiveURL,
                                 url.possibly_invalid_spec());
@@ -480,19 +499,11 @@
 }
 
 std::string ChromeContentClient::GetProduct() const {
-  chrome::VersionInfo version_info;
-  return version_info.is_valid() ?
-      version_info.ProductNameAndVersionForUserAgent() : std::string();
+  return ::GetProduct();
 }
 
 std::string ChromeContentClient::GetUserAgent() const {
-  std::string product = GetProduct();
-#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 {