Skipping profile cleaning step

Firefox should be able to work without this preparation activity, but we
have to watch CI carefully to ensure this is true. The reason for this
change is not just the driver performance on start. Running Firefox 40
with -silent option on the profile prepared by Selenium crashes the
browser.

Author: barancev

java/client/src/org/openqa/selenium/firefox/FirefoxBinary.java

@@ -237,16 +237,6 @@ public String getConsoleOutput() throws IOException {
     return Streams.drainStream(stream);
   }
 
-  public void clean(FirefoxProfile profile, File profileDir) throws IOException {
-    startProfile(profile, profileDir, "-silent");
-    try {
-      waitFor(timeout);
-    } catch (InterruptedException e) {
-      process.destroy();
-      throw new WebDriverException(e);
-    }
-  }
-
   public long getTimeout() {
     return timeout;
   }

java/client/src/org/openqa/selenium/firefox/internal/MarionetteConnection.java

@@ -23,7 +23,6 @@
 
 import org.openqa.selenium.Beta;
 import org.openqa.selenium.WebDriverException;
-import org.openqa.selenium.WebElement;
 import org.openqa.selenium.firefox.ExtensionConnection;
 import org.openqa.selenium.firefox.FirefoxBinary;
 import org.openqa.selenium.firefox.FirefoxDriver;
@@ -107,8 +106,6 @@ public void start() throws IOException {
     try {
       profileDir = profile.layoutOnDisk();
 
-      process.clean(profile, profileDir);
-
       String firefoxLogFile = System.getProperty(FirefoxDriver.SystemProperty.BROWSER_LOGFILE);
 
       if (firefoxLogFile !=  null) {

java/client/src/org/openqa/selenium/firefox/internal/NewProfileExtensionConnection.java

@@ -92,8 +92,6 @@ public void start() throws IOException {
 
       profileDir = profile.layoutOnDisk();
 
-      process.clean(profile, profileDir);
-
       delegate = new HttpCommandExecutor(buildUrl(host, port));
       delegate.setLocalLogs(logs);
       String firefoxLogFile = System.getProperty(FirefoxDriver.SystemProperty.BROWSER_LOGFILE);