Revert of Utilize FrameSelection::setSelection() taking SelectionInDOMTree/SelectionInFlatTree

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

Index: third_party/WebKit/Source/core/editing/InputMethodController.cpp
diff --git a/third_party/WebKit/Source/core/editing/InputMethodController.cpp b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
index b618db2bc3f70868830da25a3e96d76c5111bb31..22f16bb5d2fbb913e4ac9ad7d32c472468662efe 100644
--- a/third_party/WebKit/Source/core/editing/InputMethodController.cpp
+++ b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
@@ -177,8 +177,9 @@
 
   // The composition can start inside a composed character sequence, so we have
   // to override checks. See <http://bugs.webkit.org/show_bug.cgi?id=15781>
-  frame().selection().setSelection(
-      SelectionInDOMTree::Builder().setBaseAndExtent(range).build(), 0);
+  VisibleSelection selection;
+  selection.setWithoutValidation(range.startPosition(), range.endPosition());
+  frame().selection().setSelection(selection, 0);
 }
 
 bool InputMethodController::finishComposingText(
@@ -477,10 +478,11 @@
         compositionStart + composing.length() - commonSuffixLength;
     const EphemeralRange& deletionRange =
         PlainTextRange(deletionStart, deletionEnd).createRange(*editable);
+    VisibleSelection selection;
+    selection.setWithoutValidation(deletionRange.startPosition(),
+                                   deletionRange.endPosition());
     Document* const currentDocument = frame().document();
-    frame().selection().setSelection(
-        SelectionInDOMTree::Builder().setBaseAndExtent(deletionRange).build(),
-        0);
+    frame().selection().setSelection(selection, 0);
     clear();
 
     // FrameSeleciton::setSelection() can change document associate to |frame|.