[d8] Fix the shared-library build

src/inspector/BUILD.gn

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("../../gni/v8.gni")
 
 _inspector_protocol = "//third_party/WebKit/Source/platform/inspector_protocol"
 import("$_inspector_protocol/inspector_protocol.gni")
 
 _protocol_generated = [
@@ skipping 88 matching lines @@
     cflags += [
       "/wd4267",  # Truncation from size_t to int.
       "/wd4305",  # Truncation from 'type1' to 'type2'.
       "/wd4324",  # Struct padded due to declspec(align).
       "/wd4714",  # Function marked forceinline not inlined.
       "/wd4800",  # Value forced to bool.
       "/wd4996",  # Deprecated function call.
     ]
   }
   if (is_component_build) {
-    defines = [
-      "V8_SHARED",
-      "BUILDING_V8_SHARED",
-    ]
+    defines = [ "BUILDING_V8_SHARED" ]
   }
 }
 
 v8_source_set("inspector") {
   deps = [
     ":inspector_debugger_script",
     ":inspector_injected_script",
     ":protocol_generated_sources",
   ]
   configs = [ ":inspector_config" ]
@@ skipping 61 matching lines @@
     "V8RuntimeAgentImpl.cpp",
     "V8RuntimeAgentImpl.h",
     "V8SchemaAgentImpl.cpp",
     "V8SchemaAgentImpl.h",
     "V8StackTraceImpl.cpp",
     "V8StackTraceImpl.h",
     "V8ValueCopier.cpp",
     "V8ValueCopier.h",
   ]
 }