Move a bunch more code into the content namespace.

content/browser/web_contents/web_drag_source_mac.h

Index: content/browser/web_contents/web_drag_source_mac.h
===================================================================
--- content/browser/web_contents/web_drag_source_mac.h	(revision 163514)
+++ content/browser/web_contents/web_drag_source_mac.h	(working copy)
@@ -9,15 +9,17 @@
 #include "base/memory/scoped_ptr.h"
 #include "googleurl/src/gurl.h"
 
+struct WebDropData;
+namespace content {
 class WebContentsImpl;
-struct WebDropData;
+}
 
 // A class that handles tracking and event processing for a drag and drop
 // originating from the content area.
 @interface WebDragSource : NSObject {
  @private
   // Our contents. Weak reference (owns or co-owns us).
-  WebContentsImpl* contents_;
+  content::WebContentsImpl* contents_;
 
   // The view from which the drag was initiated. Weak reference.
   NSView* contentsView_;
@@ -50,7 +52,7 @@
 // Initialize a WebDragSource object for a drag (originating on the given
 // contentsView and with the given dropData and pboard). Fill the pasteboard
 // with data types appropriate for dropData.
-- (id)initWithContents:(WebContentsImpl*)contents
+- (id)initWithContents:(content::WebContentsImpl*)contents
                   view:(NSView*)contentsView
               dropData:(const WebDropData*)dropData
                  image:(NSImage*)image