Remove legacy StartsWithASCII function.

components/enhanced_bookmarks/enhanced_bookmark_model_unittest.cc

Index: components/enhanced_bookmarks/enhanced_bookmark_model_unittest.cc
diff --git a/components/enhanced_bookmarks/enhanced_bookmark_model_unittest.cc b/components/enhanced_bookmarks/enhanced_bookmark_model_unittest.cc
index 15e9dfed511433e561ae87287821e89b0dbfb841..d953a27b891a2b75f7fdd60de936172938e166b3 100644
--- a/components/enhanced_bookmarks/enhanced_bookmark_model_unittest.cc
+++ b/components/enhanced_bookmarks/enhanced_bookmark_model_unittest.cc
@@ -369,7 +369,8 @@ TEST_F(EnhancedBookmarkModelTest, TestDoubleEncodeDecode) {
 TEST_F(EnhancedBookmarkModelTest, TestRemoteId) {
   const BookmarkNode* node = AddBookmark();
   // Verify that the remote id starts with the correct prefix.
-  EXPECT_TRUE(base::StartsWithASCII(model_->GetRemoteId(node), "ebc_", true));
+  EXPECT_TRUE(base::StartsWith(model_->GetRemoteId(node), "ebc_",
+                               base::CompareCase::SENSITIVE));
 
   // Getting the remote id for nodes that don't have them should return the
   // empty string.