[EFL] [WK2] Fix build after r141619
https://bugs.webkit.org/show_bug.cgi?id=108683

Reviewed by Benjamin Poulain.

Take a reference instead of a pointer for decoding functions.

* Shared/WebBatteryStatus.cpp:
(WebKit::WebBatteryStatus::Data::decode):
* Shared/WebBatteryStatus.h:
(Data):
* Shared/WebNetworkInfo.cpp:
(WebKit::WebNetworkInfo::Data::decode):
* Shared/WebNetworkInfo.h:
(Data):
* Shared/cairo/LayerTreeContextCairo.cpp:
(WebKit::LayerTreeContext::decode):
* Shared/efl/LayerTreeContextEfl.cpp:
(WebKit::LayerTreeContext::decode):
* Shared/soup/PlatformCertificateInfo.cpp:
(WebKit::PlatformCertificateInfo::decode):
* Shared/soup/PlatformCertificateInfo.h:
(PlatformCertificateInfo):
* Shared/soup/WebCoreArgumentCodersSoup.cpp:
(CoreIPC::::decodePlatformData):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141639 268f45cc-cd09-0410-ab3c-d52691b4dbfc