Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/spellchecker/spellcheck_platform_mac_unittest.cc

Index: chrome/browser/spellchecker/spellcheck_platform_mac_unittest.cc
diff --git a/chrome/browser/spellchecker/spellcheck_platform_mac_unittest.cc b/chrome/browser/spellchecker/spellcheck_platform_mac_unittest.cc
index 6692c8148f9275bbf5ad4e1911021fad02a234ff..a5510a6fca2bd6606f9452ebe92986e254d1c684 100644
--- a/chrome/browser/spellchecker/spellcheck_platform_mac_unittest.cc
+++ b/chrome/browser/spellchecker/spellcheck_platform_mac_unittest.cc
@@ -59,7 +59,7 @@ TEST_F(SpellcheckMacTest, IgnoreWords_EN_US) {
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTestCases); ++i) {
-    const base::string16 word(ASCIIToUTF16(kTestCases[i]));
+    const base::string16 word(base::ASCIIToUTF16(kTestCases[i]));
     const int doc_tag = spellcheck_mac::GetDocumentTag();
 
     // The word should show up as misspelled.
@@ -354,7 +354,7 @@ TEST_F(SpellcheckMacTest, SpellCheckSuggestions_EN_US) {
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTestCases); ++i) {
-    const base::string16 word(ASCIIToUTF16(kTestCases[i].input));
+    const base::string16 word(base::ASCIIToUTF16(kTestCases[i].input));
     EXPECT_FALSE(spellcheck_mac::CheckSpelling(word, 0)) << word;
 
     // Check if the suggested words occur.
@@ -362,7 +362,7 @@ TEST_F(SpellcheckMacTest, SpellCheckSuggestions_EN_US) {
     spellcheck_mac::FillSuggestionList(word, &suggestions);
     bool suggested_word_is_present = false;
     const base::string16 suggested_word(
-        ASCIIToUTF16(kTestCases[i].suggested_word));
+        base::ASCIIToUTF16(kTestCases[i].suggested_word));
     for (size_t j = 0; j < suggestions.size(); j++) {
       if (suggestions[j].compare(suggested_word) == 0) {
         suggested_word_is_present = true;
@@ -378,7 +378,7 @@ TEST_F(SpellcheckMacTest, SpellCheckSuggestions_EN_US) {
 // the language used in that sentence. Test that it is filtered out from
 // RequestTextCheck results.
 TEST_F(SpellcheckMacTest, SpellCheckIgnoresOrthography)  {
-  base::string16 test_string(ASCIIToUTF16("Icland is awesome."));
+  base::string16 test_string(base::ASCIIToUTF16("Icland is awesome."));
   spellcheck_mac::RequestTextCheck(0, test_string, callback_);
   WaitForCallback();
   EXPECT_TRUE(callback_finished_);