remove stray .h file from the compile sources list

base/base.xcodeproj/project.pbxproj

Index: base/base.xcodeproj/project.pbxproj
===================================================================
--- base/base.xcodeproj/project.pbxproj	(revision 7245)
+++ base/base.xcodeproj/project.pbxproj	(working copy)
@@ -37,7 +37,6 @@
 /* Begin PBXBuildFile section */
 		141593B80EA63EBE00E32418 /* thread_collision_warner_unittest.cc in Sources */ = {isa = PBXBuildFile; fileRef = 146C6A6E0EA63D970029E7B6 /* thread_collision_warner_unittest.cc */; };
 		146C6A6B0EA63D4F0029E7B6 /* thread_collision_warner.cc in Sources */ = {isa = PBXBuildFile; fileRef = 146C6A620EA63CAE0029E7B6 /* thread_collision_warner.cc */; };
-		146C6A6C0EA63D4F0029E7B6 /* thread_collision_warner.h in Sources */ = {isa = PBXBuildFile; fileRef = 146C6A610EA63C9F0029E7B6 /* thread_collision_warner.h */; };
 		4D11B59A0E91730200EF7617 /* rand_util.cc in Sources */ = {isa = PBXBuildFile; fileRef = 4D11B5940E9172F800EF7617 /* rand_util.cc */; };
 		4D11B59B0E91730200EF7617 /* rand_util_posix.cc in Sources */ = {isa = PBXBuildFile; fileRef = 4D11B5960E9172F800EF7617 /* rand_util_posix.cc */; };
 		4D11B59C0E91730500EF7617 /* rand_util_unittest.cc in Sources */ = {isa = PBXBuildFile; fileRef = 4D11B5970E9172F800EF7617 /* rand_util_unittest.cc */; };
@@ -1410,7 +1409,6 @@
 				84B581DC0EDC715A00A6B5B3 /* test_file_util_mac.cc in Sources */,
 				93E703240E5D64F00046259B /* thread.cc in Sources */,
 				146C6A6B0EA63D4F0029E7B6 /* thread_collision_warner.cc in Sources */,
-				146C6A6C0EA63D4F0029E7B6 /* thread_collision_warner.h in Sources */,
 				7BAE38AC0E6EFDBA00C3F750 /* thread_local_posix.cc in Sources */,
 				829E36730DC0FBAD00819EBF /* thread_local_storage_posix.cc in Sources */,
 				824654910DC25A8C007C2BAA /* time.cc in Sources */,