Coverity: Fix call to string->empty() that meant ->clear()

CID=127
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/304009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30243 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/spellcheck_worditerator.cc

@@ -185,7 +185,7 @@ void SpellcheckWordIterator::Initialize(
 bool SpellcheckWordIterator::GetNextWord(string16* word_string,
                                          int* word_start,
                                          int* word_length) {
-  word_string->empty();
+  word_string->clear();
   *word_start = 0;
   *word_length = 0;
   while (position_ < length_) {