Rename the DownloadService to DownloadCoreService

The class currently named DownloadService provides access to a number of
internal details to the core of the download system in Chrome. While
it's a service in that it's a KeyedService with a factory, it's not
*the* service that services downloads.

A new project has been started to add an actual download service, that
enables different systems in Chrome to download files. That's the thing
that really should be called DownloadService.

BUG=

Review-Url: https://codereview.chromium.org/2853363002
Cr-Commit-Position: refs/heads/master@{#468729}
diff --git a/chrome/browser/lifetime/browser_close_manager_browsertest.cc b/chrome/browser/lifetime/browser_close_manager_browsertest.cc
index c25223d..4074797 100644
--- a/chrome/browser/lifetime/browser_close_manager_browsertest.cc
+++ b/chrome/browser/lifetime/browser_close_manager_browsertest.cc
@@ -18,9 +18,9 @@
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
+#include "chrome/browser/download/download_core_service.h"
+#include "chrome/browser/download/download_core_service_factory.h"
 #include "chrome/browser/download/download_prefs.h"
-#include "chrome/browser/download/download_service.h"
-#include "chrome/browser/download/download_service_factory.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/lifetime/keep_alive_types.h"
 #include "chrome/browser/lifetime/scoped_keep_alive.h"
@@ -996,7 +996,7 @@
   close_observer.Wait();
   EXPECT_TRUE(browser_shutdown::IsTryingToQuit());
   EXPECT_TRUE(BrowserList::GetInstance()->empty());
-  EXPECT_EQ(1, DownloadService::NonMaliciousDownloadCountAllProfiles());
+  EXPECT_EQ(1, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
 
   // Attempting to close again should not crash.
   TestBrowserCloseManager::AttemptClose(
@@ -1013,7 +1013,7 @@
   // Set up the fake delegate that forces the download to be malicious.
   std::unique_ptr<TestDownloadManagerDelegate> test_delegate(
       new TestDownloadManagerDelegate(browser()->profile()));
-  DownloadServiceFactory::GetForBrowserContext(browser()->profile())
+  DownloadCoreServiceFactory::GetForBrowserContext(browser()->profile())
       ->SetDownloadManagerDelegateForTesting(std::move(test_delegate));
 
   // Run a dangerous download, but the user doesn't make a decision.
@@ -1070,9 +1070,9 @@
   EXPECT_TRUE(browser_shutdown::IsTryingToQuit());
   EXPECT_TRUE(BrowserList::GetInstance()->empty());
   if (browser_defaults::kBrowserAliveWithNoWindows)
-    EXPECT_EQ(1, DownloadService::NonMaliciousDownloadCountAllProfiles());
+    EXPECT_EQ(1, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
   else
-    EXPECT_EQ(0, DownloadService::NonMaliciousDownloadCountAllProfiles());
+    EXPECT_EQ(0, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
 }
 
 // Test shutdown with a download in progress in an off-the-record profile.
@@ -1106,7 +1106,7 @@
   close_observer.Wait();
   EXPECT_TRUE(browser_shutdown::IsTryingToQuit());
   EXPECT_TRUE(BrowserList::GetInstance()->empty());
-  EXPECT_EQ(0, DownloadService::NonMaliciousDownloadCountAllProfiles());
+  EXPECT_EQ(0, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
 }
 
 // Test shutdown with a download in progress in a regular profile an inconito
@@ -1154,9 +1154,9 @@
   EXPECT_TRUE(browser_shutdown::IsTryingToQuit());
   EXPECT_TRUE(BrowserList::GetInstance()->empty());
   if (browser_defaults::kBrowserAliveWithNoWindows)
-    EXPECT_EQ(1, DownloadService::NonMaliciousDownloadCountAllProfiles());
+    EXPECT_EQ(1, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
   else
-    EXPECT_EQ(0, DownloadService::NonMaliciousDownloadCountAllProfiles());
+    EXPECT_EQ(0, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
 }
 
 // Test shutdown with a download in progress from one profile, where the only
@@ -1211,9 +1211,9 @@
   EXPECT_TRUE(browser_shutdown::IsTryingToQuit());
   EXPECT_TRUE(BrowserList::GetInstance()->empty());
   if (browser_defaults::kBrowserAliveWithNoWindows)
-    EXPECT_EQ(1, DownloadService::NonMaliciousDownloadCountAllProfiles());
+    EXPECT_EQ(1, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
   else
-    EXPECT_EQ(0, DownloadService::NonMaliciousDownloadCountAllProfiles());
+    EXPECT_EQ(0, DownloadCoreService::NonMaliciousDownloadCountAllProfiles());
 }
 
 // Test shutdown with downloads in progress and beforeunload handlers.