First cut at Firefox import on OSX + stubs for Safari import.

chrome/chrome.gyp

Index: chrome/chrome.gyp
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index 88512ea2809e58f22d917caa01055122b8c951e1..c77a11dd2185277b094cadab4398fbfa3ee47b49 100644
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -1232,7 +1232,7 @@
         'browser/importer/firefox3_importer.h',
         'browser/importer/firefox_importer_utils.cc',
         'browser/importer/firefox_importer_utils_linux.cc',
-        'browser/importer/firefox_importer_utils_mac.cc',
+        'browser/importer/firefox_importer_utils_mac.mm',
         'browser/importer/firefox_importer_utils_win.cc',
         'browser/importer/firefox_importer_utils.h',
         'browser/importer/firefox_profile_lock.cc',
@@ -1250,6 +1250,7 @@
         'browser/importer/nss_decryptor_linux.cc',
         'browser/importer/nss_decryptor_linux.h',
         'browser/importer/nss_decryptor_mac.h',
+        'browser/importer/nss_decryptor_mac.mm',
         'browser/importer/nss_decryptor_win.cc',
         'browser/importer/nss_decryptor_win.h',
         'browser/importer/toolbar_importer.cc',
@@ -3971,7 +3972,6 @@
             'browser/download/download_manager_unittest.cc',
             'browser/gtk/go_button_gtk_unittest.cc',
             'browser/gtk/tabs/tab_renderer_gtk_unittest.cc',
-            'browser/importer/firefox_importer_unittest.cc',
             'browser/tab_contents/navigation_controller_unittest.cc',
             'browser/task_manager_unittest.cc',
             'third_party/hunspell/google/hunspell_tests.cc',