Move global function isInline() to static function in IndentOutdentCommand.cpp

This patch moves global function |isInline()| defined in
"EditingUtilities.{cpp,h}" to "IndentOutdentCommand.cpp" to reduce number of
global functions for improving code health since |isInline()| is used only in
"IndentOutdentCommand.cpp".

BUG=n/a
TEST=n/a; No behavior changes

Review URL: https://codereview.chromium.org/1315073002

git-svn-id: svn://svn.chromium.org/blink/trunk@201216 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/editing/EditingUtilities.h

@@ -130,7 +130,6 @@ inline bool canHaveChildrenForEditing(const Node* node)
 
 bool isAtomicNode(const Node*);
 CORE_EXPORT bool isBlock(const Node*);
-bool isInline(const Node*);
 bool isTabHTMLSpanElement(const Node*);
 bool isTabHTMLSpanElementTextNode(const Node*);
 bool isMailHTMLBlockquoteElement(const Node*);

third_party/WebKit/Source/core/editing/commands/IndentOutdentCommand.cpp

@@ -48,6 +48,12 @@ static bool isHTMLListOrBlockquoteElement(const Node* node)
     return isHTMLUListElement(element) || isHTMLOListElement(element) || element.hasTagName(blockquoteTag);
 }
 
+static bool isInline(const Node* node)
+{
+    return node && node->layoutObject() && node->layoutObject()->isInline();
+}
+
+
 IndentOutdentCommand::IndentOutdentCommand(Document& document, EIndentType typeOfAction)
     : ApplyBlockElementCommand(document, blockquoteTag, "margin: 0 0 0 40px; border: none; padding: 0px;")
     , m_typeOfAction(typeOfAction)