Various IWYU fixes.

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 30 matching lines @@
 #include "src/flags.h"
 #include "src/isolate.h"
 #include "src/objects.h"
 #include "src/parsing/parse-info.h"
 #include "src/parsing/parser.h"
 #include "src/parsing/parsing.h"
 #include "src/parsing/preparser.h"
 #include "src/parsing/rewriter.h"
 #include "src/parsing/scanner-character-streams.h"
 #include "src/parsing/token.h"
+#include "src/unicode-cache.h"
 #include "src/utils.h"
 
 #include "test/cctest/cctest.h"
 
 TEST(ScanKeywords) {
   struct KeywordToken {
     const char* keyword;
     i::Token::Value token;
   };
 
@@ skipping 8634 matching lines @@
     DCHECK_NOT_NULL(scope);
     DCHECK_NULL(scope->sibling());
     DCHECK(scope->is_function_scope());
     const i::AstRawString* var_name =
         info.ast_value_factory()->GetOneByteString("my_var");
     i::Variable* var = scope->Lookup(var_name);
     CHECK_EQ(inners[i].ctxt_allocate,
              i::ScopeTestHelper::MustAllocateInContext(var));
   }
 }