[gcc 4.8] Remove multi-line comment to avoid build break due to -Werror=comment

extensions/browser/computed_hashes_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "crypto/sha2.h"
 #include "extensions/browser/computed_hashes.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 60 matching lines @@
   EXPECT_EQ(hashes2, read_hashes2);
 }
 
 // Note: the expected hashes used in this test were generated using linux
 // command line tools. E.g., from a bash prompt:
 //  $ printf "hello world" | openssl dgst -sha256 -binary | base64
 //
 // The file with multiple-blocks expectations were generated by doing:
 // $ for i in `seq 500 ; do printf "hello world" ; done > hello.txt
 // $ dd if=hello.txt bs=4096 count=1 | openssl dgst -sha256 -binary | base64
-// $ dd if=hello.txt skip=1 bs=4096 count=1 | \
+// $ dd if=hello.txt skip=1 bs=4096 count=1 |
 //   openssl dgst -sha256 -binary | base64
 TEST(ComputedHashes, ComputeHashesForContent) {
   const int block_size = 4096;
 
   // Simple short input.
   std::string content1 = "hello world";
   std::string content1_expected_hash =
       "uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek=";
   std::vector<std::string> hashes1;
   ComputedHashes::ComputeHashesForContent(content1, block_size, &hashes1);
@@ skipping 16 matching lines @@
   // Now an empty input.
   std::string content3;
   std::vector<std::string> hashes3;
   ComputedHashes::ComputeHashesForContent(content3, block_size, &hashes3);
   ASSERT_EQ(1u, hashes3.size());
   ASSERT_EQ(std::string("47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU="),
             Base64Encode(hashes3[0]));
 }
 
 }  // namespace extensions