Update uses of UTF conversions in content/ to use the base:: namespace.

content/browser/renderer_host/render_widget_host_view_gtk.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_gtk.h"
 
 #include <cairo/cairo.h>
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gdk/gdkx.h>
@@ skipping 927 matching lines @@
   // accidentally DOS the user with a mega tooltip (since GTK doesn't do
   // this itself).
   // I filed https://bugzilla.gnome.org/show_bug.cgi?id=604641 upstream.
   const base::string16 clamped_tooltip =
       gfx::TruncateString(tooltip_text, kMaxTooltipLength);
 
   if (clamped_tooltip.empty()) {
     gtk_widget_set_has_tooltip(view_.get(), FALSE);
   } else {
     gtk_widget_set_tooltip_text(view_.get(),
-                                UTF16ToUTF8(clamped_tooltip).c_str());
+                                base::UTF16ToUTF8(clamped_tooltip).c_str());
   }
 }
 
 void RenderWidgetHostViewGtk::SelectionChanged(const base::string16& text,
                                                size_t offset,
                                                const gfx::Range& range) {
   RenderWidgetHostViewBase::SelectionChanged(text, offset, range);
 
   if (text.empty() || range.is_empty())
     return;
@@ skipping 450 matching lines @@
 
 bool RenderWidgetHostViewGtk::RetrieveSurrounding(std::string* text,
                                                   size_t* cursor_index) {
   if (!selection_range_.IsValid())
     return false;
 
   size_t offset = selection_range_.GetMin() - selection_text_offset_;
   DCHECK(offset <= selection_text_.length());
 
   if (offset == selection_text_.length()) {
-    *text = UTF16ToUTF8(selection_text_);
+    *text = base::UTF16ToUTF8(selection_text_);
     *cursor_index = text->length();
     return true;
   }
 
   *text = base::UTF16ToUTF8AndAdjustOffset(
       base::StringPiece16(selection_text_), &offset);
   if (offset == base::string16::npos) {
     NOTREACHED() << "Invalid offset in UTF16 string.";
     return false;
   }
@@ skipping 173 matching lines @@
     gfx::PluginWindowHandle id) {
   plugin_container_manager_.CreatePluginContainer(id);
 }
 
 void RenderWidgetHostViewGtk::OnDestroyPluginContainer(
     gfx::PluginWindowHandle id) {
   plugin_container_manager_.DestroyPluginContainer(id);
 }
 
 }  // namespace content