base: Remove the string logging from CHECK().

tools/gn/parser.cc

Index: tools/gn/parser.cc
diff --git a/tools/gn/parser.cc b/tools/gn/parser.cc
index 447dfcf5b0fce5466a0aad329594530fe2a25ee9..cadd89f087f955c5de46873798951a25afaed70f 100644
--- a/tools/gn/parser.cc
+++ b/tools/gn/parser.cc
@@ -803,7 +803,8 @@ void Parser::TraverseOrder(const ParseNode* root,
     } else if (root->AsEnd()) {
       // Nothing.
     } else {
-      CHECK(false) << "Unhandled case in TraverseOrder.";
+      // Unhandled case in TraverseOrder.
+      CHECK(false);
     }
 
     post->push_back(root);
@@ -821,7 +822,8 @@ void Parser::AssignComments(ParseNode* file) {
   int cur_comment = 0;
   for (auto* node : pre) {
     if (node->GetRange().is_null()) {
-      CHECK_EQ(node, file) << "Only expected on top file node";
+      // Only expected on top file node
+      CHECK_EQ(node, file);
       continue;
     }
     const Location& start = node->GetRange().begin();