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

extensions/browser/computed_hashes_unittest.cc

Index: extensions/browser/computed_hashes_unittest.cc
diff --git a/extensions/browser/computed_hashes_unittest.cc b/extensions/browser/computed_hashes_unittest.cc
index dbcae72f4ae6056f9a8bdd283141dab257269fcf..c7d36a6a10827e1ca0f2634fef72b6eb3009b7ea 100644
--- a/extensions/browser/computed_hashes_unittest.cc
+++ b/extensions/browser/computed_hashes_unittest.cc
@@ -78,7 +78,7 @@ TEST(ComputedHashes, ComputedHashes) {
 // 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;