Expand FrameSeleciton::isContentRichlyEditable()

This patch expands |FrameSeleciton::isContentRichlyEditable()| to increase
chance of hoisting update layout.

Note: This is mechanical change to replace |selection().isContentRichlyEditable()|
by
|selection().computeVisibleSelectionInDOMTreeDeprecated().isContentRichlyEditable()|
Following patch will remove deprecated version.

This patch is part of expanding expensive member functions in |FrameSelection|:
- rootEditableElement()
- hasEditableStyle()
- isContentEditable()
- isContentRichlyEditable()
- base()
- extent()
- start()
- end()
- isNone()
- isCaret()
- isRange()

BUG=694360
TEST=n/a; no behavior changes

Review-Url: https://codereview.chromium.org/2706023003
Cr-Commit-Position: refs/heads/master@{#451707}
3 files changed