Add CaseMap and TextOffsetMap to wtf/forward.h

Bug: 985201
Change-Id: If3bd3914a758b8b7c79b688a4abd721d3c683850
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1726270Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682317}

third_party/blink/renderer/platform/wtf/forward.h

@@ -45,6 +45,7 @@ class ArrayPiece;
 class AtomicString;
 class BigInt64Array;
 class BigUint64Array;
+class CaseMap;
 class Float32Array;
 class Float64Array;
 class Int8Array;
@@ -55,6 +56,7 @@ class String;
 class StringBuilder;
 class StringImpl;
 class StringView;
+class TextOffsetMap;
 class TextStream;
 class Uint8Array;
 class Uint8ClampedArray;
@@ -71,6 +73,7 @@ using WTF::ArrayPiece;
 using WTF::AtomicString;
 using WTF::BigInt64Array;
 using WTF::BigUint64Array;
+using WTF::CaseMap;
 using WTF::Float32Array;
 using WTF::Float64Array;
 using WTF::Int8Array;
@@ -81,6 +84,7 @@ using WTF::StringBuffer;
 using WTF::StringBuilder;
 using WTF::StringImpl;
 using WTF::StringView;
+using WTF::TextOffsetMap;
 using WTF::Uint8Array;
 using WTF::Uint8ClampedArray;
 using WTF::Uint16Array;