Disable ProfileKeyedServices on import process by default.

chrome/browser/webdata/web_data_service.cc

Index: chrome/browser/webdata/web_data_service.cc
diff --git a/chrome/browser/webdata/web_data_service.cc b/chrome/browser/webdata/web_data_service.cc
index 8ebc206ac0b350b30c9e619f9706d5fceb6d00c5..020039d86077b912df3360f38be1e3b1bd2faa3f 100644
--- a/chrome/browser/webdata/web_data_service.cc
+++ b/chrome/browser/webdata/web_data_service.cc
@@ -87,10 +87,14 @@ WebDataService::WebDataService()
       failed_init_(false),
       should_commit_(false),
       main_loop_(MessageLoop::current()) {
+  // WebDataService should not be instantiated on the ImportProcess, because
+  // the Web Data file cannot be shared, and opening it will cause the main
+  // process to fail to open the profile.
+  CHECK(!ProfileManager::IsImportProcess(*CommandLine::ForCurrentProcess()));
+
   // WebDataService requires DB thread if instantiated.
   // Set WebDataServiceFactory::GetInstance()->SetTestingFactory(&profile, NULL)
   // if you do not want to instantiate WebDataService in your test.
-  DCHECK(!ProfileManager::IsImportProcess(*CommandLine::ForCurrentProcess()));
   DCHECK(BrowserThread::IsWellKnownThread(BrowserThread::DB));
 }