Move pageScaleFactor code from Frame.{h|cpp} to Page.{h|cpp}

Move pageScaleFactor code from Frame.{h|cpp} to Page.{h|cpp}
https://bugs.webkit.org/show_bug.cgi?id=67250

Reviewed by Simon Fraser.

Source/WebCore:

No new tests because there's no change in functionality.

* WebCore.exp.in:
* css/CSSStyleSelector.cpp:
(WebCore::CSSStyleSelector::styleForDocument):
* dom/Element.cpp:
(WebCore::Element::getClientRects):
(WebCore::Element::getBoundingClientRect):
* dom/Range.cpp:
(WebCore::adjustFloatQuadsForScrollAndAbsoluteZoomAndPageScale):
* loader/HistoryController.cpp:
(WebCore::HistoryController::restoreScrollPositionAndViewState):
* page/Frame.cpp:
(WebCore::Frame::Frame):
(WebCore::Frame::pageScaleFactor):
* page/Frame.h:
* page/Page.cpp:
(WebCore::Page::Page):
(WebCore::Page::setPageScaleFactor):
* page/Page.h:
(WebCore::Page::pageScaleFactor):
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::shouldPropagateCompositingToEnclosingFrame):
(WebCore::RenderLayerCompositor::pageScaleFactor):
* rendering/RenderView.cpp:
(WebCore::RenderView::paintBoxDecorations):

Source/WebKit/chromium:

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::pageScaleFactor):
(WebKit::WebViewImpl::scalePage):

Source/WebKit/gtk:

* WebCoreSupport/DumpRenderTreeSupportGtk.cpp:
(DumpRenderTreeSupportGtk::scalePageBy):

Source/WebKit/mac:

* WebView/WebView.mm:
(-[WebView _scaleWebView:atOrigin:]):
(-[WebView _viewScaleFactor]):

Source/WebKit/qt:

* WebCoreSupport/DumpRenderTreeSupportQt.cpp:
(DumpRenderTreeSupportQt::scalePageBy):

Source/WebKit2:

* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::dispatchDidCommitLoad):
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::scalePage):
(WebKit::WebPage::pageScaleFactor):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@94889 268f45cc-cd09-0410-ab3c-d52691b4dbfc