Get rid of unused parameter from CaretBase::invalidateCaretRect()

This patch gets rid of unused parameter |caretRectChanged| from
|CaretBase::invalidateCaretRect()|, since it is always |false| as default
parameter, for improving code health.

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

Review-Url: https://codereview.chromium.org/2320933002
Cr-Commit-Position: refs/heads/master@{#417239}

third_party/WebKit/Source/core/editing/CaretBase.cpp

@@ -181,11 +181,8 @@ bool CaretBase::shouldRepaintCaret(const LayoutViewItem view) const
     return false;
 }
 
-void CaretBase::invalidateCaretRect(Node* node, bool caretRectChanged)
+void CaretBase::invalidateCaretRect(Node* node)
 {
-    if (caretRectChanged)
-        return;
-
     if (LayoutViewItem view = node->document().layoutViewItem()) {
         node->document().updateStyleAndLayoutTree();
         if (hasEditableStyle(*node) || shouldRepaintCaret(view))

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

@@ -50,7 +50,7 @@ public:
     explicit CaretBase(CaretVisibility = CaretVisibility::Hidden);
     virtual ~CaretBase();
 
-    void invalidateCaretRect(Node*, bool caretRectChanged = false);
+    void invalidateCaretRect(Node*);
     void clearCaretRect();
     // Creating VisiblePosition causes synchronous layout so we should use the
     // PositionWithAffinity version if possible.