Unreviewed. Fixing the build for ports on 64-bit Linux.

Add IPC encoding and decoding overloads for the long long type, needed
after r170755 started encoding and decoding long long variables in
FormDataElement.

* Platform/IPC/ArgumentDecoder.cpp:
(IPC::ArgumentDecoder::decode):
* Platform/IPC/ArgumentDecoder.h:
* Platform/IPC/ArgumentEncoder.cpp:
(IPC::ArgumentEncoder::encode):
* Platform/IPC/ArgumentEncoder.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170795 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Source/WebCore: Unreviewed. Fixing the build after r170795.

Mac didn't like that change as it seems to properly typedef long long to int64_t.
That's not the case on 64-bit Linux (for some reason), so I'm changing the type of
the two long long variables in FormDataElement to int64_t to avoid any further trouble.

* platform/network/FormData.h:

Source/WebKit2: Unreviewed. Reverting the bad changes introduced in r170795.

* Platform/IPC/ArgumentDecoder.cpp:
(IPC::ArgumentDecoder::decode): Deleted.
* Platform/IPC/ArgumentDecoder.h:
* Platform/IPC/ArgumentEncoder.cpp:
(IPC::ArgumentEncoder::encode): Deleted.
* Platform/IPC/ArgumentEncoder.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170799 268f45cc-cd09-0410-ab3c-d52691b4dbfc