This matches Mozilla and WebKit1.

Fixes <http://webkit.org/b/60568> <rdar://problem/8610657> REGRESSION (WebKit2): Flash
plugin doesn't appear on a hanes.com page

Test: plugins/get-targeted-javascript-url.html

Reviewed by Anders Carlsson.

Source/WebKit2:

* WebProcess/Plugins/PluginView.cpp:
(WebKit::PluginView::performJavaScriptURLRequest): Don't call back to the plugin if the
request had a target.

LayoutTests:

Test what happens when a plugin makes a targeted javascript: request

* plugins/get-targeted-javascript-url-expected.txt: Added.
* plugins/get-targeted-javascript-url.html: Added.
(startTest): Tell the plugin to make two targeted javascript: requests. One calls a function
with a return value, the other calls a function with no return value.
(finishTest): Check that both functions were called, and that we either didn't get an
NPP_URLNotify call (like in Mozilla, WebKit1, and WebKit2), or got an NPP_URLNotify call
with NPRES_DONE (like in Chrome).

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86259 268f45cc-cd09-0410-ab3c-d52691b4dbfc