Remove unneccessary 'throws' annotations

If you use the addExtension methods you have to handle an IOException although it cannot be thrown.
The constructors of FileExtension/ClasspathExtension do not throw IOExceptions. So the 'throws' annotation of the method addExtension is not neccessary.

Signed-off-by: Luke Inman-Semerau <luke.semerau@gmail.com>

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

@@ -190,7 +190,7 @@ public boolean containsWebDriverExtension() {
     return extensions.containsKey("webdriver");
   }
 
-  public void addExtension(Class<?> loadResourcesUsing, String loadFrom) throws IOException {
+  public void addExtension(Class<?> loadResourcesUsing, String loadFrom) {
     // Is loadFrom a file?
     File file = new File(loadFrom);
     if (file.exists()) {
@@ -205,9 +205,8 @@ public void addExtension(Class<?> loadResourcesUsing, String loadFrom) throws IO
    * Attempt to add an extension to install into this instance.
    *
    * @param extensionToInstall File pointing to the extension
-   * @throws IOException IO Exception if can't read the extension to install
    */
-  public void addExtension(File extensionToInstall) throws IOException {
+  public void addExtension(File extensionToInstall) {
     addExtension(extensionToInstall.getName(), new FileExtension(extensionToInstall));
   }