Remove unused flag is_zygote flag from ImageSpace.

Bug: 169925964
Test: cd art && mma
Change-Id: I5f69a6d3fb3fe2fec5b32b0ae91c00ccbcabedf0
diff --git a/dex2oat/dex2oat_image_test.cc b/dex2oat/dex2oat_image_test.cc
index 62d0e83..20841f7 100644
--- a/dex2oat/dex2oat_image_test.cc
+++ b/dex2oat/dex2oat_image_test.cc
@@ -426,7 +426,6 @@
                                                 kRuntimeISA,
                                                 relocate,
                                                 /*executable=*/ true,
-                                                /*is_zygote=*/ false,
                                                 /*extra_reservation_size=*/ 0u,
                                                 &boot_image_spaces,
                                                 &extra_reservation);
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index 6fdc4e4..4a03e61 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -420,7 +420,6 @@
                                        image_instruction_set,
                                        runtime->ShouldRelocate(),
                                        /*executable=*/ !runtime->IsAotCompiler(),
-                                       is_zygote,
                                        heap_reservation_size,
                                        &boot_image_spaces,
                                        &heap_reservation)) {
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index f84cf50..1dee6a6 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -2220,20 +2220,16 @@
                   const std::string& image_location,
                   InstructionSet image_isa,
                   bool relocate,
-                  bool executable,
-                  bool is_zygote)
+                  bool executable)
       : boot_class_path_(boot_class_path),
         boot_class_path_locations_(boot_class_path_locations),
         image_location_(image_location),
         image_isa_(image_isa),
         relocate_(relocate),
         executable_(executable),
-        is_zygote_(is_zygote),
         has_system_(false) {
   }
 
-  bool IsZygote() const { return is_zygote_; }
-
   void FindImageFiles() {
     BootImageLayout layout(image_location_, boot_class_path_, boot_class_path_locations_);
     std::string image_location = layout.GetPrimaryImageLocation();
@@ -3097,7 +3093,6 @@
   const InstructionSet image_isa_;
   const bool relocate_;
   const bool executable_;
-  const bool is_zygote_;
   bool has_system_;
 };
 
@@ -3161,7 +3156,6 @@
     const InstructionSet image_isa,
     bool relocate,
     bool executable,
-    bool is_zygote,
     size_t extra_reservation_size,
     /*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
     /*out*/MemMap* extra_reservation) {
@@ -3182,8 +3176,7 @@
                          image_location,
                          image_isa,
                          relocate,
-                         executable,
-                         is_zygote);
+                         executable);
   loader.FindImageFiles();
 
   // Collect all the errors.
diff --git a/runtime/gc/space/image_space.h b/runtime/gc/space/image_space.h
index 0a706b8..545f659 100644
--- a/runtime/gc/space/image_space.h
+++ b/runtime/gc/space/image_space.h
@@ -128,7 +128,6 @@
       const InstructionSet image_isa,
       bool relocate,
       bool executable,
-      bool is_zygote,
       size_t extra_reservation_size,
       /*out*/std::vector<std::unique_ptr<ImageSpace>>* boot_image_spaces,
       /*out*/MemMap* extra_reservation) REQUIRES_SHARED(Locks::mutator_lock_);
diff --git a/runtime/gc/space/image_space_test.cc b/runtime/gc/space/image_space_test.cc
index 25f2198..6208a73 100644
--- a/runtime/gc/space/image_space_test.cc
+++ b/runtime/gc/space/image_space_test.cc
@@ -140,7 +140,6 @@
                                      kRuntimeISA,
                                      /*relocate=*/ false,
                                      /*executable=*/ true,
-                                     /*is_zygote=*/ false,
                                      /*extra_reservation_size=*/ 0u,
                                      &boot_image_spaces,
                                      &extra_reservation);