Move nsimage_cache into base so that it can be accessed from outside of chrome

base/nsimage_cache_mac.mm

Index: base/nsimage_cache_mac.mm
===================================================================
--- base/nsimage_cache_mac.mm	(revision 27995)
+++ base/nsimage_cache_mac.mm	(working copy)
@@ -2,8 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/cocoa/nsimage_cache.h"
+#include "base/nsimage_cache_mac.h"
 
+#import <AppKit/AppKit.h>
+
 #include "base/logging.h"
 #include "base/mac_util.h"
 
@@ -18,9 +20,9 @@
 
 namespace nsimage_cache {
 
-static NSMutableDictionary *image_cache = nil;
+static NSMutableDictionary* image_cache = nil;
 
-NSImage *ImageNamed(NSString *name) {
+NSImage* ImageNamed(NSString* name) {
   DCHECK(name);
 
   // NOTE: to make this thread safe, we'd have to sync on the cache and
@@ -31,12 +33,12 @@
     DCHECK(image_cache);
   }
 
-  NSImage *result = [image_cache objectForKey:name];
+  NSImage* result = [image_cache objectForKey:name];
   if (!result) {
     DLOG_IF(INFO, [[name pathExtension] length] == 0)
         << "Suggest including the extension in the image name";
 
-    NSString *path = [mac_util::MainAppBundle() pathForImageResource:name];
+    NSString* path = [mac_util::MainAppBundle() pathForImageResource:name];
     if (path) {
       @try {
         result = [[[NSImage alloc] initWithContentsOfFile:path] autorelease];