Move global function lowestEditableAncestor() to local function in VisibleSelection.cpp
This patch moves global function |lowestEditableAncestor()| in "EditingUtilities.{cpp,h}" to local function in "VisibleSelection.cpp" to narrow visibility for improving code health and ease of implement composed tree version. This patch is a preparation of making selection to handle granularity for web component, http://crrev.com/1277863002 BUG=513568 TEST=n/a; No behavior changes Review URL: https://codereview.chromium.org/1318943002 git-svn-id: svn://svn.chromium.org/blink/trunk@201302 bbb929c8-8fbe-4397-9dbb-9b2b20218538
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