Remove content shell flag --custom-devtools-frontend

This flag is not to be confused with the Chrome flag with the same name.
This one in particular is not used anywhere.

Change-Id: Ie6ce31e516d0f4c19ab1291a8bbb37ea63eb97de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764150Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689147}

content/shell/browser/web_test/web_test_devtools_bindings.cc

@@ -88,18 +88,10 @@ GURL WebTestDevToolsBindings::MapTestURLIfNeeded(const GURL& test_url,
   base::FilePath dev_tools_path;
   bool is_debug_dev_tools = base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDebugDevTools);
-  std::string url_string;
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kCustomDevToolsFrontend)) {
-    url_string = base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-        switches::kCustomDevToolsFrontend);
-  } else {
-    // The test runner hosts DevTools resources at this path by default.
-    url_string = "http://localhost:8000/inspector-sources/";
-    if (is_debug_dev_tools)
-      url_string += "debug/";
-  }
-
+  // The test runner hosts DevTools resources at this path.
+  std::string url_string = "http://localhost:8000/inspector-sources/";
+  if (is_debug_dev_tools)
+    url_string += "debug/";
   url_string += "integration_test_runner.html?experiments=true";
   if (is_debug_dev_tools)
     url_string += "&debugFrontend=true";

content/shell/common/web_test/web_test_switches.cc

@@ -16,9 +16,6 @@ const char kCrashOnFailure[] = "crash-on-failure";
 // Run devtools tests in debug mode (not bundled and minified)
 const char kDebugDevTools[] = "debug-devtools";
 
-// Specify a custom path to devtools for devtools tests
-const char kCustomDevToolsFrontend[] = "custom-devtools-frontend";
-
 // Enable accelerated 2D canvas.
 const char kEnableAccelerated2DCanvas[] = "enable-accelerated-2d-canvas";
 

content/shell/common/web_test/web_test_switches.h

@@ -16,7 +16,6 @@ namespace switches {
 
 extern const char kAllowExternalPages[];
 extern const char kCrashOnFailure[];
-extern const char kCustomDevToolsFrontend[];
 extern const char kDebugDevTools[];
 extern const char kEnableAccelerated2DCanvas[];
 extern const char kEnableFontAntialiasing[];