Deprecate --load-component-extension command line flag

chrome/browser/extensions/extension_startup_browsertest.cc

Index: chrome/browser/extensions/extension_startup_browsertest.cc
diff --git a/chrome/browser/extensions/extension_startup_browsertest.cc b/chrome/browser/extensions/extension_startup_browsertest.cc
index 18d84224e238f178d4c18e5c209b42769820ed64..e2aa865b415e991ecc3319a13b336b9798337da7 100644
--- a/chrome/browser/extensions/extension_startup_browsertest.cc
+++ b/chrome/browser/extensions/extension_startup_browsertest.cc
@@ -307,6 +307,54 @@ IN_PROC_BROWSER_TEST_F(ExtensionsLoadMultipleTest, Test) {
   TestInjection(true, true);
 }
 
+// TODO(catmullings): Remove test in future chrome release, perhaps M59.
+class DeprecatedLoadComponentExtensionSwitchBrowserTest
+    : public ExtensionBrowserTest {
+ public:
+  DeprecatedLoadComponentExtensionSwitchBrowserTest() {}
+
+  void SetUpCommandLine(base::CommandLine* command_line) override;
+
+  ExtensionRegistry* GetExtensionRegistry() {
+    return ExtensionRegistry::Get(browser()->profile());
+  }
+};
+
+void DeprecatedLoadComponentExtensionSwitchBrowserTest::SetUpCommandLine(
+    base::CommandLine* command_line) {
+  ExtensionBrowserTest::SetUpCommandLine(command_line);
+  base::FilePath fp1(test_data_dir_.AppendASCII("app_dot_com_app/"));
+  base::FilePath fp2(test_data_dir_.AppendASCII("app/"));
+
+  command_line->AppendSwitchASCII(
+      "load-component-extension",
+      fp1.AsUTF8Unsafe() + "," + fp2.AsUTF8Unsafe());
+}
+
+// Tests that the --load-component-extension flag is not supported.
+IN_PROC_BROWSER_TEST_F(DeprecatedLoadComponentExtensionSwitchBrowserTest,
+                       DefunctLoadComponentExtensionFlag) {
+  EXPECT_TRUE(extension_service()->extensions_enabled());
+
+  // Checks that the extensions loaded with the --load-component-extension flag
+  // are not installed.
+  bool is_app_dot_com_extension_installed = false;
+  bool is_app_test_extension_installed = false;
+  for (const scoped_refptr<const extensions::Extension>& extension :
+       GetExtensionRegistry()->enabled_extensions()) {
+    if (extension->name() == "App Dot Com: The App") {
+      is_app_dot_com_extension_installed = true;
+    } else if (extension->name() == "App Test") {
+      is_app_test_extension_installed = true;
+    } else {
+      EXPECT_TRUE(
+          extensions::Manifest::IsComponentLocation(extension->location()));
+    }
+  }
+  EXPECT_FALSE(is_app_dot_com_extension_installed);
+  EXPECT_FALSE(is_app_test_extension_installed);
+}
+
 class DisableExtensionsExceptBrowserTest : public ExtensionBrowserTest {
  public:
   DisableExtensionsExceptBrowserTest() {}