[GTK] Remove TEST_RUNNER_TEST_PLUGIN_PATH

[Alicia Boya García]

TEST_RUNNER_TEST_PLUGIN_PATH seems to be just a leftover from NPAPI plugins.

It's only read by the GTK WebKitTestRunner, which will fail if not provided that environment variable.

void TestController::initializeTestPluginDirectory()
{
    GUniquePtr<char> testPluginPath(getEnvironmentVariableAsUTF8String("TEST_RUNNER_TEST_PLUGIN_PATH"));
    m_testPluginDirectory.adopt(WKStringCreateWithUTF8CString(testPluginPath.get()));
}

Where is m_testPluginDirectory used?

Tools/WebKitTestRunner/TestController.h
108:    WKStringRef testPluginDirectory() const { return m_testPluginDirectory.get(); }
617:    WKRetainPtr<WKStringRef> m_testPluginDirectory;

Tools/WebKitTestRunner/gtk/TestControllerGtk.cpp
108:    m_testPluginDirectory.adopt(WKStringCreateWithUTF8CString(testPluginPath.get()));

Tools/WebKitTestRunner/win/TestControllerWin.cpp
194:        m_testPluginDirectory.adopt(WKStringCreateWithUTF8CString(bundleDirUTF8));

Tools/WebKitTestRunner/ios/TestControllerIOS.mm
180:    m_testPluginDirectory.adopt(WKStringCreateWithCFString((CFStringRef)[[NSBundle mainBundle] bundlePath]));

Tools/WebKitTestRunner/mac/TestControllerMac.mm
169:    m_testPluginDirectory.adopt(WKStringCreateWithCFString((__bridge CFStringRef)[[NSBundle mainBundle] bundlePath]));

Okay, there is a testPluginDirectory() getter. Who uses it? This is the only use:

Tools/WebKitTestRunner/TestController.cpp
WKRetainPtr<WKPageConfigurationRef> TestController::generatePageConfiguration(const TestOptions& options)
772:    if (testPluginDirectory())
773:        WKContextSetAdditionalPluginsDirectory(m_context.get(), testPluginDirectory());

Finally, what does WKContextSetAdditionalPluginsDirectory() do?

Source/WebKit/UIProcess/API/C/WKContext.cpp
void WKContextSetAdditionalPluginsDirectory(WKContextRef contextRef, WKStringRef pluginsDirectory)
{
    UNUSED_PARAM(contextRef);
    UNUSED_PARAM(pluginsDirectory);
}

Nothing. Seems to be left just to not cause API breakage.

[Alicia Boya García]

Pull request: https://github.com/WebKit/WebKit/pull/13144

[EWS]

Committed 263369@main (984732ae28a9): <https://commits.webkit.org/263369@main>

Reviewed commits have been landed. Closing PR #13144 and removing active labels.