Do not show the EULA if it has already been accepted by the user in another user data dir.

chrome/browser/first_run/first_run_win.cc

Index: chrome/browser/first_run/first_run_win.cc
diff --git a/chrome/browser/first_run/first_run_win.cc b/chrome/browser/first_run/first_run_win.cc
index a66fd8c9631a935484c58bd87fd0b415980f8e13..31461fada071e8994744ad71e60b21974d4d079f 100644
--- a/chrome/browser/first_run/first_run_win.cc
+++ b/chrome/browser/first_run/first_run_win.cc
@@ -171,6 +171,25 @@ bool LaunchSetupWithParam(const std::string& param,
   return (TRUE == ::GetExitCodeProcess(ph, reinterpret_cast<DWORD*>(ret_code)));
 }
 
+// Returns true if the EULA is required but has not been accepted by this user.
+// The EULA is considered having been accepted if the user has gotten past
+// first run in the "other" environment (desktop or metro).
+bool IsEulaNotAccepted(installer::MasterPreferences* install_prefs) {
+  bool value = false;
+  if (install_prefs->GetBool(installer::master_preferences::kRequireEula,
+          &value) && value) {
+    // Check for a first run sentinel in the alternate user data dir.
+    FilePath alt_user_data_dir;
+    if (!PathService::Get(chrome::DIR_ALT_USER_DATA, &alt_user_data_dir) ||
+        !file_util::DirectoryExists(alt_user_data_dir) ||
+        !file_util::PathExists(alt_user_data_dir.AppendASCII(
+            first_run::internal::kSentinelFile))) {
+      return true;
+    }
+  }
+  return false;
+}
+
 // Writes the EULA to a temporary file, returned in |*eula_path|, and returns
 // true if successful.
 bool WriteEULAtoTempFile(FilePath* eula_path) {
@@ -188,9 +207,7 @@ bool WriteEULAtoTempFile(FilePath* eula_path) {
 }
 
 void ShowPostInstallEULAIfNeeded(installer::MasterPreferences* install_prefs) {
-  bool value = false;
-  if (install_prefs->GetBool(installer::master_preferences::kRequireEula,
-          &value) && value) {
+  if (IsEulaNotAccepted(install_prefs)) {
     // Show the post-installation EULA. This is done by setup.exe and the
     // result determines if we continue or not. We wait here until the user
     // dismisses the dialog.