Remove unecessary main functions.

Summary: Starting with this, but I will keep digging through these. The tests will be compiled into one combined test with a single main.

Reviewed By: yfeldblum

Differential Revision: D2841391

fb-gh-sync-id: 78fd153e282f1ca2dbe7ada942dc04fc8ba5d42d

folly/test/DemangleTest.cpp

@@ -16,7 +16,6 @@
 
 #include <folly/Demangle.h>
 
-#include <gflags/gflags.h>
 #include <gtest/gtest.h>
 
 using folly::demangle;
@@ -69,9 +68,3 @@ TEST(Demangle, strlcpy) {
   EXPECT_EQ(strlen(big_string), folly::strlcpy(buf, big_string, 0));
   EXPECT_EQ('z', buf[0]);  // unchanged, size = 0
 }
-
-int main(int argc, char *argv[]) {
-  testing::InitGoogleTest(&argc, argv);
-  gflags::ParseCommandLineFlags(&argc, &argv, true);
-  return RUN_ALL_TESTS();
-}

folly/test/FBStringTest.cpp

@@ -29,8 +29,6 @@
 #include <boost/random.hpp>
 #include <gtest/gtest.h>
 
-#include <gflags/gflags.h>
-
 #include <folly/Foreach.h>
 #include <folly/Portability.h>
 #include <folly/Random.h>
@@ -1405,9 +1403,3 @@ TEST(FBStringCtorTest, DefaultInitStructAlloc) {
   EXPECT_TRUE(t2.stringMember.empty());
   EXPECT_EQ(allocatorConstructedCount.load(), 1);
 }
-
-int main(int argc, char** argv) {
-  testing::InitGoogleTest(&argc, argv);
-  gflags::ParseCommandLineFlags(&argc, &argv, true);
-  return RUN_ALL_TESTS();
-}