https://bugs.webkit.org/show_bug.cgi?id=102822

Source/WebCore: 

Reviewed by Andreas Kling.

DocumentStyleSheetCollection::invalidateInjectedStyleSheetCache() triggers a style recalc for quirks mode
documents in the beginning of document parsing via Document::setCompatibilityMode. This often coalesces 
with style recalc triggered by stylesheet loading. However on very simple documents it can generate genuinely
unnecessary work.

* dom/DocumentStyleSheetCollection.cpp:
(WebCore::DocumentStyleSheetCollection::invalidateInjectedStyleSheetCache):
        
    Check that we actually have cached injected stylesheets before triggering style recalc.
            
* page/PageGroup.cpp:
(WebCore::PageGroup::addUserStyleSheetToWorld):
(WebCore::PageGroup::removeUserStyleSheetFromWorld):
(WebCore::PageGroup::removeUserStyleSheetsFromWorld):
(WebCore::PageGroup::removeAllUserContent):
        
    Fix a misspelling.

(WebCore::PageGroup::invalidateInjectedStyleSheetCacheInAllFrames):
        
    Always invalidate style when user sheets change since we don't do that in
    DocumentStyleSheetCollection::invalidateInjectedStyleSheetCache anymore.

* page/PageGroup.h:

LayoutTests: 

Reviewed by Andreas Kling.
        
This is a progression.

* inspector/timeline/timeline-script-tag-1-expected.txt:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153788 268f45cc-cd09-0410-ab3c-d52691b4dbfc