Move history API out of experimental. Allow extensions to override history page.

chrome/test/data/extensions/api_test/permissions/enabled/background.html

 <script>
-// All of these tests should pass, since this extension has requested all of the
-// permissions.
+// All of the calls to chrome.* functions should succeed, since this extension 
+// has requested all required permissions.
 
 var pass = chrome.test.callbackPass;
 
 chrome.test.runTests([
+  function experimental() {
+    // Test that use of an experimental API works.  
+    // If/when chrome.experimental.processes is moved out of 
+    // experimental, this test needs to be updated.
+    chrome.tabs.getSelected(null, function(tab) {
+      try {
+        chrome.experimental.processes.getProcessForTab(
+          tab.id, pass(function(process) {}));
+      } catch (e) {
+        chrome.test.fail();
+      }
+    });
+  },
+
   function history() {
     try {
       var query = { 'text': '', 'maxResults': 1 };
-      chrome.experimental.history.search(query, pass(function(results) {}));
+      chrome.history.search(query, pass(function(results) {}));
     } catch (e) {
       chrome.test.fail();
     }
   },
 
   function bookmarks() {
     try {
       chrome.bookmarks.get("1", pass(function(results) {}));
     } catch (e) {
       chrome.test.fail();
     }
   },
 
   function tabs() {
     try {
       chrome.tabs.getSelected(null, pass(function(results) {}));
     } catch (e) {
       chrome.test.fail();
     }
   }
 ]);
 </script>