Extensions cleanup: Merge IsSyncableApp+Extension, ShouldSyncApp+Extension

TBRing some straightforward changes.
TBR=msw,pkotwicz,pvalenzuela

BUG=507591

Review URL: https://codereview.chromium.org/1224693010

Cr-Commit-Position: refs/heads/master@{#338482}
diff --git a/chrome/browser/extensions/crx_installer_browsertest.cc b/chrome/browser/extensions/crx_installer_browsertest.cc
index 84984f6..7eb5b8e1 100644
--- a/chrome/browser/extensions/crx_installer_browsertest.cc
+++ b/chrome/browser/extensions/crx_installer_browsertest.cc
@@ -583,8 +583,8 @@
   const ExtensionPrefs* extension_prefs =
       ExtensionPrefs::Get(browser()->profile());
   EXPECT_TRUE(extension_prefs->DoNotSync(crx_installer->extension()->id()));
-  EXPECT_FALSE(extensions::util::ShouldSyncApp(crx_installer->extension(),
-                                               browser()->profile()));
+  EXPECT_FALSE(extensions::util::ShouldSync(crx_installer->extension(),
+                                            browser()->profile()));
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionCrxInstallerTest, ManagementPolicy) {