Fix -Wunused-lambda-capture warnings.

clang-tools-extra/clang-query/QueryParser.cpp

@@ -26,7 +26,7 @@ namespace query {
 // is found before End, return StringRef().  Begin is adjusted to exclude the
 // lexed region.
 StringRef QueryParser::lexWord() {
-  Line = Line.drop_while([this](char c) {
+  Line = Line.drop_while([](char c) {
     // Don't trim newlines.
     return StringRef(" \t\v\f\r").contains(c);
   });

clang/lib/ASTMatchers/Dynamic/Parser.cpp

@@ -297,7 +297,7 @@ private:
 
   /// Consume all leading whitespace from \c Code.
   void consumeWhitespace() {
-    Code = Code.drop_while([this](char c) {
+    Code = Code.drop_while([](char c) {
       // Don't trim newlines.
       return StringRef(" \t\v\f\r").contains(c);
     });