Remove "from all browsers" memory details mode

chrome/browser/metrics/metrics_memory_details_browsertest.cc

 // Copyright 2015 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 "chrome/browser/metrics/metrics_memory_details.h"
 
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/test/histogram_tester.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "content/public/test/test_utils.h"
 
 namespace {
 
 class TestMemoryDetails : public MetricsMemoryDetails {
  public:
   TestMemoryDetails()
       : MetricsMemoryDetails(base::Bind(&base::DoNothing), nullptr) {}
 
   void StartFetchAndWait() {
-    StartFetch(FROM_CHROME_ONLY);
+    StartFetch();
     content::RunMessageLoop();
   }
 
  private:
   ~TestMemoryDetails() override {}
 
   void OnDetailsAvailable() override {
     MetricsMemoryDetails::OnDetailsAvailable();
     // Exit the loop initiated by StartFetchAndWait().
     base::MessageLoop::current()->QuitWhenIdle();
@@ skipping 19 matching lines @@
   scoped_refptr<TestMemoryDetails> details(new TestMemoryDetails);
   details->StartFetchAndWait();
 
   // Memory.Browser histogram should have a single non-0 sample recorded.
   histogram_tester.ExpectTotalCount("Memory.Browser", 1);
   scoped_ptr<base::HistogramSamples> samples(
       histogram_tester.GetHistogramSamplesSinceCreation("Memory.Browser"));
   ASSERT_TRUE(samples);
   EXPECT_NE(0, samples->sum());
 }