Make callers of CommandLine use it via the base:: namespace.

chrome/browser/extensions/api/webstore_private/webstore_private_apitest.cc

Index: chrome/browser/extensions/api/webstore_private/webstore_private_apitest.cc
diff --git a/chrome/browser/extensions/api/webstore_private/webstore_private_apitest.cc b/chrome/browser/extensions/api/webstore_private/webstore_private_apitest.cc
index d429cd17f0b60e3ebe655c5db5cb4732fff084a7..b96d23e868b144bfefaf116a0f3f2e8987cc4345 100644
--- a/chrome/browser/extensions/api/webstore_private/webstore_private_apitest.cc
+++ b/chrome/browser/extensions/api/webstore_private/webstore_private_apitest.cc
@@ -96,7 +96,7 @@ class ExtensionWebstorePrivateApiTest : public ExtensionApiTest {
   ExtensionWebstorePrivateApiTest() {}
   ~ExtensionWebstorePrivateApiTest() override {}
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(
         switches::kAppsGalleryURL,
@@ -155,7 +155,7 @@ class ExtensionWebstorePrivateApiTest : public ExtensionApiTest {
     return true;
 #else
     GURL crx_url = GetTestServerURL(crx_file);
-    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+    base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
         switches::kAppsGalleryUpdateURL, crx_url.spec());
 
     GURL page_url = GetTestServerURL(page);
@@ -407,7 +407,7 @@ class EphemeralAppWebstorePrivateApiTest
         "http://www.example.com:%d/files/extensions/platform_apps/"
         "ephemeral_launcher",
         host_port.port());
-    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+    base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
         switches::kAppsGalleryURL, test_gallery_url);
   }
 
@@ -421,16 +421,16 @@ class EphemeralAppWebstorePrivateApiTest
 // Run tests when the --enable-ephemeral-apps switch is not enabled.
 IN_PROC_BROWSER_TEST_F(EphemeralAppWebstorePrivateApiTest,
                        EphemeralAppsFeatureDisabled) {
-  CommandLine::ForCurrentProcess()->AppendSwitch(
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
       app_list::switches::kDisableExperimentalAppList);
   ASSERT_TRUE(RunInstallTest("webstore_launch_disabled.html", "app.crx"));
 }
 
 // Run tests when the --enable-ephemeral-apps switch is enabled.
 IN_PROC_BROWSER_TEST_F(EphemeralAppWebstorePrivateApiTest, LaunchEphemeralApp) {
-  CommandLine::ForCurrentProcess()->AppendSwitch(
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableEphemeralAppsInWebstore);
-  CommandLine::ForCurrentProcess()->AppendSwitch(
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
       app_list::switches::kEnableExperimentalAppList);
   ASSERT_TRUE(RunInstallTest("webstore_launch_app.html", "app.crx"));
 }