Sync more GN unit tests with GYP.

components/suggestions/BUILD.gn

Index: components/suggestions/BUILD.gn
diff --git a/components/suggestions/BUILD.gn b/components/suggestions/BUILD.gn
index 58291765f4860dc76e827c1c4fc11738f6b6787b..389a19bb10e87caf4a49e153245a48087f95b843 100644
--- a/components/suggestions/BUILD.gn
+++ b/components/suggestions/BUILD.gn
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-static_library("suggestions") {
+source_set("suggestions") {
   sources = [
     "blacklist_store.cc",
     "blacklist_store.h",
@@ -21,17 +21,19 @@ static_library("suggestions") {
     "suggestions_utils.h",
   ]
 
-  deps = [
+  public_deps = [
     "//base",
-    "//components/keyed_service/core",
-    "//components/pref_registry",
     "//components/suggestions/proto",
-    "//components/variations",
-    "//components/variations/net",
     "//net",
     "//ui/gfx",
     "//url",
   ]
+  deps = [
+    "//components/keyed_service/core",
+    "//components/pref_registry",
+    "//components/variations",
+    "//components/variations/net",
+  ]
 
   if (is_ios) {
     sources += [ "image_encoder_ios.mm" ]
@@ -39,3 +41,18 @@ static_library("suggestions") {
     sources += [ "image_encoder.cc" ]
   }
 }
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "blacklist_store_unittest.cc",
+    "image_manager_unittest.cc",
+    "suggestions_service_unittest.cc",
+    "suggestions_store_unittest.cc",
+  ]
+  deps = [
+    ":suggestions",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}