Remove an unnecessary if statement from InlineBoxPosition.cpp

The |if| statement's condition is always false, since |level| is set to
|inline_box->BidiLevel()| in L165.

Note: The code was originally introduced in crrev.com/edfe20, which
already contains this redundant branching.

Bug: 771398
Change-Id: If83f178b8ab91f15fcc7176e429541e69a681b15
Reviewed-on: https://chromium-review.googlesource.com/991604Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547762}

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

@@ -183,11 +183,8 @@ InlineBoxPosition AdjustInlineBoxPositionForTextDirectionInternal(
     return InlineBoxPosition(result_box, result_box->CaretLeftmostOffset());
   }
 
-  if (unicode_bidi == UnicodeBidi::kPlaintext) {
-    if (inline_box->BidiLevel() < level)
-      return InlineBoxPosition(inline_box, inline_box->CaretLeftmostOffset());
+  if (unicode_bidi == UnicodeBidi::kPlaintext)
     return InlineBoxPosition(inline_box, inline_box->CaretRightmostOffset());
-  }
 
   InlineBox* const next_box = inline_box->NextLeafChildIgnoringLineBreak();
   if (!next_box || next_box->BidiLevel() < level) {