gn: Fix a couple of things after 9465fc72ad90 and 2bb56fafe3bd

When I redid the Crashpad GN build a few weeks ago
(https://chromium-review.googlesource.com/c/chromium/src/+/751403), I
tried to order things according to the GN style guide
(https://chromium.googlesource.com/chromium/src/tools/gn/+/HEAD/docs/style_guide.md).
As for conditionals, I tried to stick to doing a set of conditionals
after “sources” for just “sources”, and then another one at the bottom
for everything else.

It turns out that this was a good idea because it’s an error to say
“deps += [something]” inside a conditional until you’ve already said
“deps = [something_else]” first. (Maybe that’s why I did it.)
9465fc72ad90 regressed this.

2bb56fafe3bd also left behind a couple of straggler paths that were
absolute to Chromium’s root but should have been made relative.

This also fixes a comment (about something that won’t yet work outside
of Chromium anyway, but still…)

Bug: crashpad:79
Change-Id: I8a6f84bfad368cbcdae4fbff11f1d00e2af14b93
Reviewed-on: https://chromium-review.googlesource.com/798172
Commit-Queue: Mark Mentovai <mark@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>

compat/BUILD.gn

@@ -74,9 +74,9 @@ static_library("compat") {
   deps = []
 
   if (is_mac) {
-    deps += [ "//third_party/crashpad/crashpad/third_party/apple_cctools" ]
+    deps += [ "../third_party/apple_cctools" ]
   }
   if (is_win) {
-    deps += [ "//third_party/crashpad/crashpad/third_party/getopt" ]
+    deps += [ "../third_party/getopt" ]
   }
 }

test/BUILD.gn

@@ -47,8 +47,6 @@ static_library("test") {
   ]
 
   if (is_mac) {
-    libs = [ "bsm" ]
-    deps += [ "//third_party/crashpad/crashpad/handler" ]
     sources += [
       "mac/dyld.cc",
       "mac/dyld.h",
@@ -89,6 +87,11 @@ static_library("test") {
     "//base",
     "//testing/gtest",
   ]
+
+  if (is_mac) {
+    libs = [ "bsm" ]
+    deps += [ "../handler" ]
+  }
 }
 
 source_set("test_test") {

util/BUILD.gn

@@ -297,7 +297,7 @@ static_library("util") {
 
   public_configs = [ "..:crashpad_config" ]
 
-  # Include files from here and generated files starting with "util".
+  # Include generated files starting with "util".
   include_dirs = [ "$root_gen_dir/third_party/crashpad/crashpad" ]
 
   public_deps = [