Do not load extension system in the Profile import process.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 3ab07467d0fc54123b6f16f7fbfb722f5b46adb9..d0a068ddae5602a56d7654a5db6f340035df3cb8 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -707,6 +707,9 @@ const char kFileDescriptorLimit[]           = "file-descriptor-limit";
 // whether or not it's actually the first run.
 const char kFirstRun[]                      = "first-run";
 
+// Force a profile auto-import that would occur on a first run.
+const char kFirstRunForceImport[]           = "first-run-force-import";
+
 // Enables using GAIA information to populate profile name and icon.
 const char kGaiaProfileInfo[]               = "gaia-profile-info";