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

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

Index: chrome/test/data/extensions/api_test/permissions/experimental_disabled/background.html
diff --git a/chrome/test/data/extensions/api_test/permissions/experimental_disabled/background.html b/chrome/test/data/extensions/api_test/permissions/experimental_disabled/background.html
new file mode 100755
index 0000000000000000000000000000000000000000..c46b2e848bc1778e21bb21270337c5a602b9d04b
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/permissions/experimental_disabled/background.html
@@ -0,0 +1,19 @@
+<script>
+// Calls to chrome.experimental.* functions should fail, since this extension
+// has not declared that permission.
+
+chrome.test.runTests([
+  function experimental() {
+    chrome.tabs.getSelected(null, function(tab) {
+      try {
+        chrome.experimental.processes.getProcessForTab(tab.id, 
+                                                       function(process) {
+          chrome.test.fail();
+        });
+      } catch (e) {
+        chrome.test.succeed();
+      }
+    });
+  }
+]);
+</script>