Make all pdb file names follow the same naming convention.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 0a32c0abbc526c4464f2d2922b1f48897eb863e7..a60cd7f733afc5d460e0cae85f743ad0ed195f99 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1789,6 +1789,16 @@
               }
             }
           }],
+          ['"<(GENERATOR)"=="msvs"', {
+            'msvs_settings': {
+              'VCLinkerTool': {
+                # Make the pdb name sane. Otherwise foo.exe and foo.dll both
+                # have foo.pdb. The ninja generator already defaults to this and
+                # can't handle the $(TargetPath) macro.
+                'ProgramDatabaseFile': '$(TargetPath).pdb',
+              }
+            },
+          }],
         ],  # win_z7!=0
       }],  # OS==win
       ['enable_task_manager==1', {