Revert of Fix setComposingText with empty text when newCursorPosition != 1

components/test_runner/text_input_controller.cc

Index: components/test_runner/text_input_controller.cc
diff --git a/components/test_runner/text_input_controller.cc b/components/test_runner/text_input_controller.cc
index cd0aa73b8f394b3e6d7c1649e954ae49c103fd5f..788570bb87e9b0a8d6abebca3c641b7af5ec59fe 100644
--- a/components/test_runner/text_input_controller.cc
+++ b/components/test_runner/text_input_controller.cc
@@ -283,18 +283,14 @@
   key_down.windowsKeyCode = 0xE5;  // VKEY_PROCESSKEY
   view()->handleInputEvent(key_down);
 
-  // The value returned by std::string::length() may not correspond to the
-  // actual number of encoded characters in sequences of multi-byte or
-  // variable-length characters.
-  blink::WebString newText = blink::WebString::fromUTF8(text);
-  size_t textLength = newText.length();
-
   std::vector<blink::WebCompositionUnderline> underlines;
-  underlines.push_back(blink::WebCompositionUnderline(
-      0, textLength, SK_ColorBLACK, false, SK_ColorTRANSPARENT));
+  underlines.push_back(blink::WebCompositionUnderline(0, text.length(),
+                                                      SK_ColorBLACK, false,
+                                                      SK_ColorTRANSPARENT));
   view()->setComposition(
-      newText, blink::WebVector<blink::WebCompositionUnderline>(underlines),
-      textLength, textLength);
+      blink::WebString::fromUTF8(text),
+      blink::WebVector<blink::WebCompositionUnderline>(underlines),
+      text.length(), text.length());
 }
 
 blink::WebView* TextInputController::view() {