Remove deprecated old Reader code

Remove deprecated old Reader code

[Title] Remove deprecated old Reader code
[Issue#] N/A
[Problem] Deprecated
[Cause] It was remained for browser build only.
        WebKit's Reader API is not used in browser anymore.
[Solution] Remove Reader API set

Conflicts:

	Source/WebKit2/UIProcess/API/efl/ewk_view.cpp
	Source/WebKit2/UIProcess/efl/WebPageProxyEfl.cpp
	Source/WebKit2/WebProcess/WebPage/WebPage.h
	Source/WebKit2/WebProcess/WebPage/efl/WebPageEfl.cpp

Change-Id: I59be0f6e3c6fba5bf9df44388c07746c4f2e67c8