[BlackBerry] Handle network errors when starting a new job
https://bugs.webkit.org/show_bug.cgi?id=116101

Patch by Carlos Garcia Campos <cgarcia@igalia.com> on 2013-05-14
Reviewed by Rob Buis.

Make startJob() return a network status that can be used by the
caller to create a network error.

* platform/network/blackberry/NetworkJob.cpp:
(WebCore::NetworkJob::initialize): createNetworkStream() should
always return a valid pointer so use an ASSERT instead of an early
return to make sure we have a valid stream.
(WebCore::NetworkJob::startNewJobWithRequest): Only return true if
the network job was started successfully.
* platform/network/blackberry/NetworkJob.h:
(NetworkJob): Make initialize method void instead of bool since it
can't fail.
* platform/network/blackberry/NetworkManager.cpp:
(WebCore::NetworkManager::startJob): Return a network error or
StatusSuccess.
* platform/network/blackberry/NetworkManager.h:
(NetworkManager):
* platform/network/blackberry/ResourceHandleBlackBerry.cpp:
(WebCore::ResourceHandle::start): Return true if job was started
successfully.
(WebCore::ResourceHandle::platformLoadResourceSynchronously):
Check return value of startJob and fill the ResourceError with the
network status returned to finish the load.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150076 268f45cc-cd09-0410-ab3c-d52691b4dbfc