Use is_same_document term instead of is_in_page for metrics.

components/navigation_metrics/navigation_metrics.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/navigation_metrics/navigation_metrics.h"
 
 #include "base/macros.h"
 #include "base/metrics/histogram_macros.h"
 #include "url/gurl.h"
 
@@ skipping 32 matching lines @@
 };
 
 static_assert(arraysize(kSchemeNames) == SCHEME_MAX + 1,
               "kSchemeNames should have SCHEME_MAX + 1 elements");
 
 }  // namespace
 
 namespace navigation_metrics {
 
 void RecordMainFrameNavigation(const GURL& url,
-                               bool is_in_page,
+                               bool is_same_document,
                                bool is_off_the_record) {
   Scheme scheme = SCHEME_UNKNOWN;
   for (int i = 1; i < SCHEME_MAX; ++i) {
     if (url.SchemeIs(kSchemeNames[i])) {
       scheme = static_cast<Scheme>(i);
       break;
     }
   }
 
   UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameScheme", scheme, SCHEME_MAX);
-  if (!is_in_page) {
+  if (!is_same_document) {
     UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameSchemeDifferentPage", scheme,
                               SCHEME_MAX);
   }
 
   if (is_off_the_record) {
     UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameSchemeOTR", scheme,
                               SCHEME_MAX);
-    if (!is_in_page) {
+    if (!is_same_document) {
       UMA_HISTOGRAM_ENUMERATION("Navigation.MainFrameSchemeDifferentPageOTR",
                                 scheme, SCHEME_MAX);
     }
   }
 }
 
 }  // namespace navigation_metrics