Revert of Prevent duplicate content script injection defined in manifest.json

chrome/browser/extensions/content_script_apitest.cc

Index: chrome/browser/extensions/content_script_apitest.cc
diff --git a/chrome/browser/extensions/content_script_apitest.cc b/chrome/browser/extensions/content_script_apitest.cc
index ac8dd75b9c8151cbced27f896376b2a6eb10646f..c8d442885dff659576a6f2f6fc95385d298d0f84 100644
--- a/chrome/browser/extensions/content_script_apitest.cc
+++ b/chrome/browser/extensions/content_script_apitest.cc
@@ -335,43 +335,6 @@
   }
 };
 
-IN_PROC_BROWSER_TEST_F(ExtensionApiTest,
-                       ContentScriptDuplicateScriptInjection) {
-  host_resolver()->AddRule("maps.google.com", "127.0.0.1");
-  ASSERT_TRUE(StartEmbeddedTestServer());
-
-  GURL url(
-      base::StringPrintf("http://maps.google.com:%i/extensions/test_file.html",
-                         embedded_test_server()->port()));
-
-  ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII(
-      "content_scripts/duplicate_script_injection")));
-
-  ui_test_utils::NavigateToURL(browser(), url);
-
-  // Test that a script that matches two separate, yet overlapping match
-  // patterns is only injected once.
-  bool scripts_injected_once = false;
-  ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
-      browser()->tab_strip_model()->GetActiveWebContents(),
-      "window.domAutomationController.send("
-      "document.getElementsByClassName('injected-once')"
-      ".length == 1)",
-      &scripts_injected_once));
-  ASSERT_TRUE(scripts_injected_once);
-
-  // Test that a script injected at two different load process times, document
-  // idle and document end, is injected exactly twice.
-  bool scripts_injected_twice = false;
-  ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
-      browser()->tab_strip_model()->GetActiveWebContents(),
-      "window.domAutomationController.send("
-      "document.getElementsByClassName('injected-twice')"
-      ".length == 2)",
-      &scripts_injected_twice));
-  ASSERT_TRUE(scripts_injected_twice);
-}
-
 IN_PROC_BROWSER_TEST_F(ContentScriptCssInjectionTest,
                        ContentScriptInjectsStyles) {
   ASSERT_TRUE(StartEmbeddedTestServer());