https://bugs.webkit.org/show_bug.cgi?id=72511

Reviewed by Simon Hausmann.

Source/WebCore:

Always send a viewport update per page load as we depend on that,
to reset all viewport handling before doing layout.

* page/Page.cpp:
(WebCore::Page::updateViewportArguments):

Source/WebKit2:

The code handling use-fixed-layout wasn't 100% reliable. The code
was changed to make sure the value is always correct.

It also doesn't set the value by looking at the previous FrameView,
as that wouldn't work in cases, such as when the web process has
crashes.

* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage):
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::WebPage):
(WebKit::WebPage::setResizesToContentsUsingLayoutSize):
(WebKit::WebPage::setUseFixedLayout):
* WebProcess/WebPage/WebPage.h:
(WebKit::WebPage::useFixedLayout):

    Store the state as m_useFixedLayout so that it can be used
    from the WebFrameLoaderClient.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@100594 268f45cc-cd09-0410-ab3c-d52691b4dbfc