Rework ExtensionApiUnittest to run in extensions_unittests, removing its Chrome dependencies.

extensions/extensions.gyp

Index: extensions/extensions.gyp
diff --git a/extensions/extensions.gyp b/extensions/extensions.gyp
index 8edeb114ab57a3a8579887672235ed5e87259d31..09446e52b101dd997c752e7395a91ac4f6f95a19 100644
--- a/extensions/extensions.gyp
+++ b/extensions/extensions.gyp
@@ -769,6 +769,7 @@
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
+        '../components/components.gyp:user_prefs',
         '../net/net.gyp:net_test_support',
         '../testing/gtest.gyp:gtest',
         'browser/api/api_registration.gyp:extensions_api_registration',
@@ -874,6 +875,7 @@
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:base',
+        '../base/base.gyp:base_prefs_test_support',
         '../base/base.gyp:test_support_base',
         '../components/components.gyp:keyed_service_content',
         '../content/content_shell_and_tests.gyp:test_support_content',
@@ -901,10 +903,13 @@
         'browser/admin_policy_unittest.cc',
         'browser/api/api_resource_manager_unittest.cc',
         'browser/api/declarative/deduping_factory_unittest.cc',
+        'browser/api/sockets_tcp/sockets_tcp_api_unittest.cc',
         'browser/computed_hashes_unittest.cc',
         'browser/content_hash_tree_unittest.cc',
         'browser/event_listener_map_unittest.cc',
         'browser/event_router_unittest.cc',
+        'browser/api_unittest.cc',
+        'browser/api_unittest.h',
         'browser/extension_pref_value_map_unittest.cc',
         'browser/extension_registry_unittest.cc',
         'browser/file_highlighter_unittest.cc',