[Cleanup] Factor out common code.

chrome/browser/memory/tab_manager.cc

Index: chrome/browser/memory/tab_manager.cc
diff --git a/chrome/browser/memory/tab_manager.cc b/chrome/browser/memory/tab_manager.cc
index 2f491f4c042f68c7dabd6c717df2906adb35b7f3..1621b7feb35d1b4aa027e113c73628aefdf33755 100644
--- a/chrome/browser/memory/tab_manager.cc
+++ b/chrome/browser/memory/tab_manager.cc
@@ -36,6 +36,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/chrome_pages.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/tabs/tab_utils.h"
@@ -357,24 +358,6 @@ void TabManager::PurgeMemoryAndDiscardTab() {
   }
 }
 
-// static
-bool TabManager::IsInternalPage(const GURL& url) {
-  // There are many chrome:// UI URLs, but only look for the ones that users
-  // are likely to have open. Most of the benefit is the from NTP URL.
-  const char* const kInternalPagePrefixes[] = {
-      chrome::kChromeUIDownloadsURL, chrome::kChromeUIHistoryURL,
-      chrome::kChromeUINewTabURL, chrome::kChromeUISettingsURL,
-  };
-  // Prefix-match against the table above. Use strncmp to avoid allocating
-  // memory to convert the URL prefix constants into std::strings.
-  for (size_t i = 0; i < arraysize(kInternalPagePrefixes); ++i) {
-    if (!strncmp(url.spec().c_str(), kInternalPagePrefixes[i],
-                 strlen(kInternalPagePrefixes[i])))
-      return true;
-  }
-  return false;
-}
-
 void TabManager::RecordDiscardStatistics() {
   discard_count_++;
 
@@ -480,7 +463,7 @@ void TabManager::AddTabStats(const TabStripModel* model,
       TabStats stats;
       stats.is_app = is_app;
       stats.is_internal_page =
-          IsInternalPage(contents->GetLastCommittedURL());
+          chrome::IsInternalPage(contents->GetLastCommittedURL());
       stats.is_media = IsMediaTab(contents);
       stats.is_pinned = model->IsTabPinned(i);
       stats.is_selected = active_model && model->IsTabSelected(i);