Move StartsWith[ASCII] to base namespace.

chrome/common/extensions/manifest_tests/extension_manifests_homepage_unittest.cc

Index: chrome/common/extensions/manifest_tests/extension_manifests_homepage_unittest.cc
diff --git a/chrome/common/extensions/manifest_tests/extension_manifests_homepage_unittest.cc b/chrome/common/extensions/manifest_tests/extension_manifests_homepage_unittest.cc
index 5a1afab97c64bbeae51cde0a1ba2e0894cf2e78d..5ba958251634a2b99c366673c7d38ef1470b6702 100644
--- a/chrome/common/extensions/manifest_tests/extension_manifests_homepage_unittest.cc
+++ b/chrome/common/extensions/manifest_tests/extension_manifests_homepage_unittest.cc
@@ -39,10 +39,9 @@ TEST_F(HomepageURLManifestTest, GetHomepageURL) {
   // The Google Gallery URL ends with the id, which depends on the path, which
   // can be different in testing, so we just check the part before id.
   extension = LoadAndExpectSuccess("homepage_google_hosted.json");
-  EXPECT_TRUE(StartsWithASCII(
+  EXPECT_TRUE(base::StartsWithASCII(
       extensions::ManifestURL::GetHomepageURL(extension.get()).spec(),
-      "https://chrome.google.com/webstore/detail/",
-      false));
+      "https://chrome.google.com/webstore/detail/", false));
 
   extension = LoadAndExpectSuccess("homepage_externally_hosted.json");
   EXPECT_EQ(GURL(), extensions::ManifestURL::GetHomepageURL(extension.get()));