Clean up use of GetDalvikCache.

Switch the only caller of the non-void version of GetDalvikCache that set
create_if_absent true to use the void version of GetDalvikCache. Then no
callers of the non-void version of GetDalvikCache set create_if_absent to
true, so that argument is no longer needed. And without create_if_absent,
there is no case when the function will abort, so the 'OrDie" option is no
longer necessary.

Change-Id: I83f60dcc8a8f3b1f91fd2971e9028f6a7dd8384d
Test: m art-test-host
Test: m art-test-target
diff --git a/runtime/utils_test.cc b/runtime/utils_test.cc
index 55b6e01..d2100d1 100644
--- a/runtime/utils_test.cc
+++ b/runtime/utils_test.cc
@@ -337,11 +337,9 @@
 }
 
 TEST_F(UtilsTest, GetDalvikCache) {
-  EXPECT_STREQ("", GetDalvikCache("should-not-exist123", false).c_str());
+  EXPECT_STREQ("", GetDalvikCache("should-not-exist123").c_str());
 
-  EXPECT_STREQ((android_data_ + "/dalvik-cache/.").c_str(), GetDalvikCache(".", false).c_str());
-  EXPECT_STREQ((android_data_ + "/dalvik-cache/should-not-be-there").c_str(),
-               GetDalvikCache("should-not-be-there", true).c_str());
+  EXPECT_STREQ((android_data_ + "/dalvik-cache/.").c_str(), GetDalvikCache(".").c_str());
 }