Remove use of NewTabPageAdapter.getItems() from test.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index b704fa9311847768c4e62616ec55ee15c5d71a22..0cf620f37822b6f7bbff001abd065b32e6861a7d 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -2359,6 +2359,7 @@ if (is_android) {
     deps = [
       ":base_java",
       "//testing/android/reporter:reporter_java",
+      "//third_party/hamcrest:hamcrest_core_java",
     ]
     java_files = [
       "test/android/javatests/src/org/chromium/base/test/BaseActivityInstrumentationTestCase.java",
@@ -2377,6 +2378,7 @@ if (is_android) {
       "test/android/javatests/src/org/chromium/base/test/util/InstrumentationUtils.java",
       "test/android/javatests/src/org/chromium/base/test/util/IntegrationTest.java",
       "test/android/javatests/src/org/chromium/base/test/util/Manual.java",
+      "test/android/javatests/src/org/chromium/base/test/util/Matchers.java",
       "test/android/javatests/src/org/chromium/base/test/util/MetricsUtils.java",
       "test/android/javatests/src/org/chromium/base/test/util/MinAndroidSdkLevel.java",
       "test/android/javatests/src/org/chromium/base/test/util/MinAndroidSdkLevelSkipCheck.java",