Prefix string16 with base:: in ui/.

ui/base/clipboard/clipboard_mac.mm

Index: ui/base/clipboard/clipboard_mac.mm
diff --git a/ui/base/clipboard/clipboard_mac.mm b/ui/base/clipboard/clipboard_mac.mm
index 8aee1d3bbfaeff1ea70d0cd01c84a94005d2da44..a774db0335ead13666c82cc4e22d1a8569f43e3b 100644
--- a/ui/base/clipboard/clipboard_mac.mm
+++ b/ui/base/clipboard/clipboard_mac.mm
@@ -223,7 +223,7 @@ void Clipboard::Clear(ClipboardType type) {
 }
 
 void Clipboard::ReadAvailableTypes(ClipboardType type,
-                                   std::vector<string16>* types,
+                                   std::vector<base::string16>* types,
                                    bool* contains_filenames) const {
   DCHECK(CalledOnValidThread());
   types->clear();
@@ -245,7 +245,7 @@ void Clipboard::ReadAvailableTypes(ClipboardType type,
   }
 }
 
-void Clipboard::ReadText(ClipboardType type, string16* result) const {
+void Clipboard::ReadText(ClipboardType type, base::string16* result) const {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(type, CLIPBOARD_TYPE_COPY_PASTE);
   NSPasteboard* pb = GetPasteboard();
@@ -269,7 +269,7 @@ void Clipboard::ReadAsciiText(ClipboardType type, std::string* result) const {
 }
 
 void Clipboard::ReadHTML(ClipboardType type,
-                         string16* markup,
+                         base::string16* markup,
                          std::string* src_url,
                          uint32* fragment_start,
                          uint32* fragment_end) const {
@@ -327,8 +327,8 @@ SkBitmap Clipboard::ReadImage(ClipboardType type) const {
 }
 
 void Clipboard::ReadCustomData(ClipboardType clipboard_type,
-                               const string16& type,
-                               string16* result) const {
+                               const base::string16& type,
+                               base::string16* result) const {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(clipboard_type, CLIPBOARD_TYPE_COPY_PASTE);
 
@@ -340,7 +340,7 @@ void Clipboard::ReadCustomData(ClipboardType clipboard_type,
   }
 }
 
-void Clipboard::ReadBookmark(string16* title, std::string* url) const {
+void Clipboard::ReadBookmark(base::string16* title, std::string* url) const {
   DCHECK(CalledOnValidThread());
   NSPasteboard* pb = GetPasteboard();