Make iOS main() functions normal.

The weird foo_mains are no longer needed when we build with GN.

CQ_INCLUDE_TRYBOTS=skia.primary:Build-Mac-Clang-arm-Debug-iOS

Change-Id: Iae50696741e0dc277d96dda4968a1ae41cb17c8a
Reviewed-on: https://skia-review.googlesource.com/8064
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Stephan Altmueller <stephana@google.com>
diff --git a/tools/imgblur.cpp b/tools/imgblur.cpp
index 23ba815..20d3684 100644
--- a/tools/imgblur.cpp
+++ b/tools/imgblur.cpp
@@ -25,8 +25,7 @@
 static const int kSuccess = 0;
 static const int kError = 1;
 
-int tool_main(int argc, char** argv);
-int tool_main(int argc, char** argv) {
+int main(int argc, char** argv) {
     SkCommandLineFlags::SetUsage("Brute force blur of an image.");
     SkCommandLineFlags::Parse(argc, argv);
 
@@ -72,9 +71,3 @@
 
     return kSuccess;
 }
-
-#if !defined SK_BUILD_FOR_IOS
-int main(int argc, char * const argv[]) {
-    return tool_main(argc, (char**) argv);
-}
-#endif