Move language detection to a component

components/components_tests.gypi

Index: components/components_tests.gypi
diff --git a/components/components_tests.gypi b/components/components_tests.gypi
index 94b87007517ef409eeabcb90957640d353a3fc66..44b89a18792cd5d23ef4f729ba6713b18024a244 100644
--- a/components/components_tests.gypi
+++ b/components/components_tests.gypi
@@ -22,6 +22,9 @@
             'navigation_interception/intercept_navigation_resource_throttle_unittest.cc',
             'sessions/serialized_navigation_entry_unittest.cc',
             'test/run_all_unittests.cc',
+            'translate/common/translate_metrics_unittest.cc',
+            'translate/common/translate_util_unittest.cc',
+            'translate/language_detection/language_detection_util_unittest.cc',
             # TODO(asvitkine): These should be tested on iOS too.
             'variations/entropy_provider_unittest.cc',
             'variations/metrics_util_unittest.cc',
@@ -72,6 +75,10 @@
             'sessions',
             'sessions_test_support',
 
+            # Dependencies of translate.
+            'translate_common',
+            'translate_language_detection',
+
             # Dependencies of variations
             'variations',