Bump the min-supported OS version in the installer.

chrome/installer/setup/setup_main.cc

Index: chrome/installer/setup/setup_main.cc
diff --git a/chrome/installer/setup/setup_main.cc b/chrome/installer/setup/setup_main.cc
index 7a4022c43508bb59eb7bc59eb7b76f5069ccb4cf..085fe65699bc5b120d80664d07e693d6960833c2 100644
--- a/chrome/installer/setup/setup_main.cc
+++ b/chrome/installer/setup/setup_main.cc
@@ -1733,10 +1733,10 @@ int WINAPI wWinMain(HINSTANCE instance, HINSTANCE prev_instance,
 
   const bool is_uninstall = cmd_line.HasSwitch(installer::switches::kUninstall);
 
-  // Check to make sure current system is WinXP or later. If not, log
+  // Check to make sure current system is Win7 or later. If not, log
   // error message and get out.
   if (!InstallUtil::IsOSSupported()) {
-    LOG(ERROR) << "Chrome only supports Windows XP or later.";
+    LOG(ERROR) << "Chrome only supports Windows 7 or later.";

[scottmg, 2016/04/12 17:32:39]

Does setup still launch on XP even?

[grt (UTC plus 2), 2016/04/12 17:58:23]

Just tried with 50.0.2661.74, and it succeeded in laying down the new version.
My ToT component build doesn't get very far at all...

     installer_state.WriteInstallerResult(
         installer::OS_NOT_SUPPORTED, IDS_INSTALL_OS_NOT_SUPPORTED_BASE, NULL);
     return installer::OS_NOT_SUPPORTED;