Enable isolated storage by default.

We've been dogfooding the isolated storage feature for many months
on various internal groups, and we're ready to enable it globally.

Bug: 112545973
Test: executed entire CTS suite using forrest
Change-Id: I612b6aba4f08dc0ac13f4f94b03c4bddd6de12df
diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index 3180d45..db098e3 100644
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -115,7 +115,7 @@
 VolumeManager::~VolumeManager() {}
 
 static bool hasIsolatedStorage() {
-    return GetBoolProperty(kIsolatedStorageSnapshot, GetBoolProperty(kIsolatedStorage, false));
+    return GetBoolProperty(kIsolatedStorageSnapshot, GetBoolProperty(kIsolatedStorage, true));
 }
 
 int VolumeManager::updateVirtualDisk() {
diff --git a/model/PublicVolume.cpp b/model/PublicVolume.cpp
index e751eca..1eb6008 100644
--- a/model/PublicVolume.cpp
+++ b/model/PublicVolume.cpp
@@ -45,8 +45,6 @@
 
 static const char* kAsecPath = "/mnt/secure/asec";
 
-static const char* kIsolatedStorage = "persist.sys.isolated_storage";
-
 PublicVolume::PublicVolume(dev_t device) : VolumeBase(Type::kPublic), mDevice(device), mFusePid(0) {
     setId(StringPrintf("public:%u,%u", major(device), minor(device)));
     mDevPath = StringPrintf("/dev/block/vold/%s", getId().c_str());