Convert string16 to base::string16 in content.

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index 4a667b0ab232b10a17f14435fff565e0fd5cbe80..ffacd53a7779cacd95e3bdeb54362a898a2340e0 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -108,10 +108,10 @@ class RenderWidgetHostViewMacEditCommandHelper;
   NSRange selectedRange_;
 
   // Text to be inserted which was generated by handling a key down event.
-  string16 textToBeInserted_;
+  base::string16 textToBeInserted_;
 
   // Marked text which was generated by handling a key down event.
-  string16 markedText_;
+  base::string16 markedText_;
 
   // Underline information of the |markedText_|.
   std::vector<blink::WebCompositionUnderline> underlines_;
@@ -264,8 +264,8 @@ class RenderWidgetHostViewMac : public RenderWidgetHostViewBase,
   virtual void RenderProcessGone(base::TerminationStatus status,
                                  int error_code) OVERRIDE;
   virtual void Destroy() OVERRIDE;
-  virtual void SetTooltipText(const string16& tooltip_text) OVERRIDE;
-  virtual void SelectionChanged(const string16& text,
+  virtual void SetTooltipText(const base::string16& tooltip_text) OVERRIDE;
+  virtual void SelectionChanged(const base::string16& text,
                                 size_t offset,
                                 const gfx::Range& range) OVERRIDE;
   virtual void SelectionBoundsChanged(
@@ -338,7 +338,7 @@ class RenderWidgetHostViewMac : public RenderWidgetHostViewBase,
   void EnableCoreAnimation();
 
   // Sends completed plugin IME notification and text back to the renderer.
-  void PluginImeCompositionCompleted(const string16& text, int plugin_id);
+  void PluginImeCompositionCompleted(const base::string16& text, int plugin_id);
 
   const std::string& selected_text() const { return selected_text_; }
 
@@ -526,7 +526,7 @@ class RenderWidgetHostViewMac : public RenderWidgetHostViewBase,
   bool is_loading_;
 
   // The text to be shown in the tooltip, supplied by the renderer.
-  string16 tooltip_text_;
+  base::string16 tooltip_text_;
 
   // Factory used to safely scope delayed calls to ShutdownHost().
   base::WeakPtrFactory<RenderWidgetHostViewMac> weak_factory_;